22 Max-Planck-Gesellschaft, Jena, Germany 5 Max Planck Society, Jena, Germany 4 Max-Planck-Gesellschaft, Germany 1 Max-Planck-Institut, Garching, Germany 1 Max-Planck-Inst., Garching, Germany 1 Max Planck Inst., Bonn, Germany 87 Max-Planck-Institut fuer extraterrestrische Physik, Garching, Federal Republic of Germany 82 Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Federal Republic of Germany 3 Max-Planck-Institut fuer extraterrestrische Physik, Munich, Federal Republic of Germany 2 Max-Planck-Institut fuer Extraterrestrische Physik, Munich, Federal Republic of Germany 1 Max-Planck-Institut fuer extraterrestrusche Physik, Garching, Federal Republic of Germany 1 Max-Planck-Institut fuer extraterrestrische Physik, Federal Republic of Germany 1 Max Planck Institute for Extraterrestrial Physics, Garching, Federal Republic of Germany 388 Max-Planck-Institut fuer Radioastronomie, Bonn, Federal Republic of Germany 5 Max-Planck-Institut fuer Radioastronomie, Federal Republic of Germany 2 Max-Planck-Institut fuer Radioastronimie, Bonn, Federal Republic of Germany 2 Max-Planck-Institut fuer Chemie, Mainz, Federal Republic of Germany 2 Max-Planck-Institut fuer Astronomie, Bonn, Federal Republic of Germany 1 Max-Planck-Institut fur Radioastronomie, Bonn, Federal Republic of Germany 1 Max-Planck-Institut fuer Radioastromomie, Bonn, Federal Republic of Germany 1 Max-Planck Institut fuer Radioastronomie, Bonn, Federal Republic of Germany 16 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching, Germany 5 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany 4 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany 3 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching bei Munchen, Germany 3 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching bei Munchen, Germany 3 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching, Germany 3 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild- Strasse 1, 85748 Garching, Germany 1 Max-Plank-Institut fur Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching, Germany 1 Max-Planck-Istitut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching bei Munchen, Germany 1 Max-Planck-Institut fur Physik and Astrophysik, Karl-Schwarzschild Strasse 1, D-85740 Garching, Germany 1 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching bei Munchen, Germany 1 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany 1 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild- Strasse 1, 85740 Garching, Germany 1 Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild Strasse 1, D-85740 Garching, Germany 1 Max Planck Institute fur Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching bei Munchen, Germany 172 Max-Planck-Institut fuer Astronomie, Heidelberg, West Germany 56 Max-Planck-Institut fuer Kernphysik, Heidelberg, West Germany 54 Max-Planck-Institut fuer Astrophysik, Garching, West Germany 22 Max-Planck-Institut fuer Aeronomie, Katlenburg, West Germany 7 Max-Planck-Institut fuer Astrophysik, Munich, West Germany 4 Max-Planck-Institut fur Astronomie, Heidelberg, West Germany 1 Max-Plank-Institut fuer Astronomie, Heidelberg, West Germany 1 Max-Planck-Institute fuer Astronomie, Heidelberg, West Germany 1 Max-Planck-Institut fur Plasmaphysik GmbH, Garching, West Germany 1 Max-Planck-Institut fur Aeronomie, Katlenburg, West Germany 1 Max-Planck-Institut fuer Meteorologie, Hamburg, West Germany 1 Max-Planck-Institut fuer Chemie, Mainz, West Germany 1 Max-Planck-Institut fuer Astrophysik, Muenich, West Germany 1 Max-Planck-Institut fuer Aeronomie, Katlenberg, West Germany 1 Max-Planck-Institut fuer Aeronomie, Heidelberg, West Germany 1 Max-Planck-Instituet fuer Astronomie, Heidelberg, West Germany 1 Max-Planck-Inst. fuer Astrophysik, Garching, Muenchen, Germany 1 Max-Planck Institut fuer Aeronomie, Katlenburg, West Germany 1 Max Planck-Institut fuer Kernphysik, Heidelberg, West Germany 185 Max-Planck-Inst. fuer Extraterrestrische Physik, Garching, Germany 75 Max-Planck-Institut fuer extraterrestrische Physik, Garching, West Germany 45 Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany 21 Max-Planck-Institut fuer Extraterrestrische Physik, Garching, West Germany 17 Max-Planck-Institut fuer extraterrestrische Physik, Garching, Germany 15 Max-Planck-Inst. fuer extraterrestrische Physik, Garching, Germany 9 Max-Planck-Institut fuer extraterrestrische Physik, Muenchen, Germany 8 Max-Planck Institut fuer extraterrestrische Physik, Garching, Germany 7 Max-Plack-Institut fur Extraterrestrische Physik, Garching, Germany 6 Max-Planck-Institut fur extraterrestrische Physik, Garching, West Germany 6 Max-Planck-Institut fur Extraterrestrische Physik, D-85740 Garching, Germany 6 Max-Planck-Institut fuer Extraterrestrische, Garching, Germany 5 Max-Planck Inst. fuer Extraterrestrische Physik, Garching, Germany 5 Max Planck Inst. fuer Extraterrestrische Physik, Garching, Germany 4 Max-Planck-Institut fur extraterrestrische Physik, 85740 Garching, Germany 4 Max-Planck-Institut fuer extraterrestrische Physik, Garching 4 Max-Planck-Institut fuer Extraterrestriche Physik, Garching, Germany 4 Max-Planck Institute fuer Extraterrestriche Physik, Garching, Germany 4 Max-Planck Institut fuer extraterrestriche Physik, Garching, Germany 4 Max-Planck Institut fuer Extraterrestrische, Garching, Germany 4 Max Planck Inst. fuer Extraterrestrische Physik, Garching, Muenchen, Germany 3 Max-Planck-Institut fur extraterrestrische Physik, D-85740 Garching, Germany 3 Max-Planck-Institut fuer Extraterrestrische Physik, Muenchen, Germany 3 Max-Planck-Inst. fuer Extraterrestrische Physik, Muenchen, Germany 2 Max-Planck-Institut fur extraterrestrische Physik, 8046 Garching, Germany 2 Max-Planck-Institut fuer extraterrestrische Physik, Munich, West Germany 2 Max-Planck-Institut fuer Extraterrestrische Physik, Germany 2 Max-Planck-Institut fuer Extraterrestrische Physik, Garching 2 Max-Planck-Institut fuer Extra Terrestrische Physik, Munchen, Germany 2 Max-Planck-Inst. fuer Extraterrestrische Physick, Garching, Germany 1 Max-Planck-Institute fur extraterrestrische Physik, Garching, West Germany 1 Max-Planck-Institute fur Extraterrestrische Physik, 85740 Garching, Germany 1 Max-Planck-Institute fuer Exrtraterrestrische Physik, Garching, Germany 1 Max-Planck-Institut fur extraterrestrische Physik, 85748 Garching, Germany 1 Max-Planck-Institut fur Extraterrestrische Physik, W-8046 Garching, Germany 1 Max-Planck-Institut fur Extraterrestrische Physik, D85470 Garching, Germany 1 Max-Planck-Institut fuer extraterrestrische Physik, Garching, West 1 Max-Planck-Institut fuer extraterrestrische Physik, Garching, W 1 Max-Planck-Institut fuer extraterrestrische Physik, Garching, Muenchen, Germ 1 Max-Planck-Institut fuer Extraterristrische Physik, Garching, West Germany 1 Max-Planck-Institut fuer Extraterrestrishe Physik, Garching, West Germany 1 Max-Planck-Institut fuer Extraterrestrishce Physik, Garching, Germany 1 Max-Planck-Institut fuer Extraterrestrische, Physik, Garching, West Germany 1 Max-Planck-Institut fuer Extraterrestrische Physik, Munich, Germany 1 Max-Planck-Institut fuer Extraterrestrische Physik, Garching, West 1 Max-Planck-Institut fuer Extraterrestriche Physik, Garching, West Germany 1 Max-Planck-Institut fuer Extraerrestrische Physik, Garching, Germany 1 Max-Planck-Inst. fuer Extraterrestrische Physik, Berlin, Germany 1 Max-Planck-Inst fuer Extraterrestrische Physik, Garching, Germany 1 Max-Planck Instiut fuer Extraterrestrische Physik, Garching, Germany 1 Max-Planck Institut fur extraterrestrische Physik, Garching, West Germany 1 Max-Planck Institut fur Extraterrestrische Physik, D-85740 Garching, Germany 1 Max-Planck Institut fuer extraterrestrische Physik, Garching, West Germany 1 Max-Planck Institut fuer Extraterrestrishce Physik, Muenchen, Germany 1 Max-Planck Inst. fuer extraterrestrische Physik, Garching, Germany 1 Max Planck Institut fuer Extraterrestrische Physik, Muenchen, Germany 1 Max Planck Institut fuer Extraterrestrische Physik, Garching, Germany 1 Max Planck Institut fuer Extraterrestriche Physik, Garching, Germany 53 Observatoire de la Cote d'Azur, Nice, France 18 Observatoire de la Cote d'Azur, Grasse, France 7 Observatoire de la Cote-d'Azur, Nice, France 1 Observatoire de Cote d'Azur, Nice, France 137 Observatoire Midi-Pyrenees, Toulouse, France 4 Observatoire Midi Pyrenees, Toulouse, France 2 Observatoire de Midi-Pyrenees, Toulouse, France 1 Observatoire Midi-Pyrennes, Toulouse, France 1 Observatoire Midi-Pyrennees, Toulouse, France 1 Observatoire Midi-Pyreneees, Toulouse, France 92 Dartmouth College, Hanover, NH 19 Smith College, Northampton, MA 15 Lafayette College, Easton, PA 12 Carleton College, Northfield, MN 9 Bentley College, Waltham, MA 8 Williams College, Williamstown, MA 8 Wheaton College, Norton, MA 6 Wellesley College, Wellesley, MA, US 6 Colby College, Waterville, ME 5 Wellesley College, Wellesley, Mass. 5 Emmanuel College, Boston, MA 4 Wellesley College, Wellesley, MA 3 Saint Mary's College, Moraga, CA 3 Rhodes College, Memphis, TN 3 Kenyon College, Gambier, OH 3 Citrus College, Azusa, CA 3 Centre College, Danville, KY 2 Regis College, Weston, MA 2 Grinnell College, Grinnell, IA 2 Eastern College, Saint Davids, PA 2 Canisius College, Buffalo, NY 2 Alma College, Alma, MI, US 1 Whitman College, Walla Walla, WA 1 Spelman College, Atlanta, GA 1 SofTech, Waltham, MA 1 Pomona College, Claremont, CA 1 Manhattan College, Bronx, NY 1 Lambuth College, Jackson, TN 1 Ithaca College, Ithaca, NY 1 Hollins College, Roanoke, VA 1 Hampshire College, Amherst, MA 1 Dickinson College, Carlisle, PA 1 Cabrillo College, Aptos, CA 1 Boston College, Newton, MA, US 1 Boston College, Newton, MA 1 Beloit College, Beloit, WI, US 1 Bates College, Lewiston, ME 1 Amherst College, Amherst, MA 65 Chicago Univ., IL 59 Colorado Univ., Boulder 42 Toronto Univ., Canada 41 Princeton Univ., NJ 31 Bologna Univ., Italy 27 Amsterdam Univ. 23 Montreal Univ., Canada 22 Boston Univ., MA 21 Montreal Univ. 15 Clemson Univ., SC 14 Johns Hopkins Univ. 12 Pittsburgh Univ., PA 12 California Univ. 12 Barcelona Univ. 11 Waterloo Univ., Canada 11 Toledo Univ., OH 10 Chicago Univ. 9 College de France 9 CSIC, Granada, Spain 8 Texas Univ. 8 New York Univ., NY 7 Villanova Univ., PA 7 Rochester Univ., NY 7 Catania Univ. 7 CNR, Bologna, Italy 7 Bologna Univ. 6 Utrecht State Univ. 6 IRAM, Granada, Spain 6 CONICET, Argentina 5 Univ. of Crete 5 Trieste Univ. 5 Pisa Univ. 5 Palermo Univ. 5 Napoli, Univ. 5 Colorado Univ. 5 Cantabria Univ. 5 Arizona Univ. 4 Salonika Univ., Greece 4 Notre Dame Univ., IN 4 Lecce Univ. 4 Georgia Univ., Athens 4 CNR, Milano, Italy 4 Bonn Univ. 3 Toronto Univ. 3 Shiraz Univ. 3 Rochester Univ. 3 Cincinnati Univ., OH 2 Wyoming Univ. 2 Virginia Univ. 2 Utrecht Univ. 2 Roma, Univ. 2 Roma I, Univ. 2 Paris VII, Univ. 2 Paris VI, Univ. 2 NRC, Ottawa, Canada 2 Massachusetts Univ. 2 Leicester Univ. 2 Leeds Univ. 2 Kyoto Univ., Uji 2 IRA, Bologna, Italy 2 Goteborg Univ., Sweden 2 Delaware Univ., Newark 2 Catania, Univ. 2 Brandon Univ., Canada 2 Bologna, Univ. 2 Bochum, Ruhr-Univ. 2 Bari Univ. 1 Wisconsin Univ. 1 Vanderbilt Univ. 1 Valparaiso Univ., IN 1 Valladolid Univ., Spain 1 USAF, Space Div. 1 Tokyo Univ. 1 Szeged Univ. 1 Sydney Univ. 1 Stockholm Univ., Sweden 1 Santiago Univ., Spain 1 Salamanca Univ., Spain 1 Roma Univ. 1 Roma II, Univ. 1 Princeton, NJ, US 1 Palermo Univ 1 Padua Univ. 1 Oxford Univ. 1 Oviedo Univ., Spain 1 New Orleans Univ., LA 1 Nanjing Univ. 1 NRC, Victoria, Canada 1 Muenster Univ. 1 Montreal, Univ. 1 Minnesota Univ. 1 Milano Univ. 1 Lund Univ. 1 Lorand Eotvos Univ. 1 Lockheed Corp. 1 Lille I, Univ., France 1 Liege Univ. 1 Leiden Univ. 1 Leiden State Univ. 1 Laval Univ. 1 La Plata Univ. 1 Keele Univ. 1 Johns Hopkins Univ., MD 1 Jena, Univ. 1 Institut za Fiziku 1 Illinois Univ., Chicago 1 ISON, WI 53706 1 Hughes/STX Corp. 1 Hughes STX, Inc. 1 Hauts-de-Seine 1 ENEA, Bologna, Italy 1 DAEC, Meudon, Paris 1 Cornell Univ. 1 Columbia Univ. 1 Cologne Univ., Germany 1 Clark Atlanta Univ., GA 1 Castellon Univ., Spain 1 Cambridge Univ. 1 California Instit 1 Calcutta Univ., India 1 CERCA, Canada 1 British Columbia Univ. 1 Bonn, Univ. 1 Belfast, Queen's Univ. 1 Auburn Univ., AL 1 Athens Univ. 1 Alcalade Henares 1 Alabama Univ. 22 City College, New York, N.Y. 16 Union College, Schenectady, NY 12 Dartmouth College, Hanover, N.H. 6 City College, New York 5 City College, New York, NY 2 Union College, Schenectady, N.Y. 2 King College, Bristol, TN, US 2 Barnard College, New York 1 Manhattan College, Bronx, N.Y. 1 Hunter College, New York, N.Y. 1 Brockport State College, New York, N.Y. 1 Barnard College, New York, NY 182 Minnesota, University, Minneapolis 35 Minnesota Univ., Minneapolis 8 Minnesota Univ., Minneapolis, MN, US 6 Missouri Univ., Saint Louis 4 Nebraska Univ., Lincoln 4 Muenchen, Univ., Munich 1 Wisconsin Univ., Milwaukee 1 Rennes I, Univ., France 1 Minnesota Univ., Morris 1 Melbourne Univ., Australia 1 Hong Kong Univ., Hong Kong 46 Univ. of Chicago, Chicago, IL, US 40 Univ. of Illinois, Urbana, IL, US 21 University of Chicago, Chicago, IL, US 6 Univ. of Chicago, Williams Bay, WI, US 6 Univ. of Calgary, Calgary, Canada 2 University of Chicago, Chicago, Illinois, US 2 Univ. of Illinios, Urbana, IL, US 2 Univ. of Chicago, Chicago, Il, US 2 Chicago Univ., Chicago, IL, US 1 Univ. of Chicago, Willams Bay, WI, US 23 California, University, Santa Barbara, CA 20 California, University, Santa Cruz, Calif. 18 California, University, Santa Barbara, Calif. 4 California, University, Santa Barbara and Berkeley, CA 4 California, University, Davis and Livermore, Calif. 2 California University, Santa Cruz, Calif. 1 California, University, Santa Cruz and Livermore, Calif. 1 California, University, Santa Cruz and Livermore 1 California, University, Santa Barbara, and Berkeley, CA 24 Nanjing University, People's Republic of China 19 Beijing University, People's Republic of China 13 Beijing Normal University, People's Republic of China 5 Nanjing, University, People's Republic of China 4 Tianjin Normal University, People's Republic of China 3 Yonsei University, Seoul, Republic of Korea 2 Tsing Hua University, Hsinchu, Republic of China 2 Nanjing Normal University, People's Republic of China 1 Sejong University, Seoul, Republic of Korea 1 Bejing University, People's Republic of China 106 Tel Aviv University, Tel Aviv, Israel 99 Tel Aviv University, Israel 46 Wise Observatory, Tel Aviv, Israel 20 Tel Aviv Univ., Israel 18 Tel Aviv Univ., Tel Aviv, Israel 4 Tel-Aviv University, Tel-Aviv, Israel 4 Tel Aviv, University, Tel Aviv, Israel 4 Tel Aviv Univ., Ramat Aviv, Israel 4 Hebrew Univ., Jerusalem, Israel 2 Tel Aviv University, Ramat Aviv, Israel 2 Ben Gurion Univ., Beer Sheva, Israel 1 Weizmann Inst., Rehovot, Israel 1 Tel-Aviv University, Israel 1 Tel-Aviv Univ., Tel-Aviv, Israel 1 Tel-Aviv Univ., Tel Aviv, Israel 1 Tel Avive University, Tel Aviv, Israel 1 Tel Aviv, University, Israel 1 Tel Aviv University, Ram-Aviv, Israel 1 Oranim Univ., Tivon, Israel 1 Ben-Gurion Univ., Beersheva, Israel 44 Univ. Nacional Autonoma de Mexico, Coyoacan 8 Universidad Nacional Autonoma de Mexico, Coyoacan 7 Univ. Nacional Autonoma de Mexico, Mexico 3 Univ. Nacional Autonoma de Mexico, Ensenada 1 Universidad Nacional Autonoma de Mexico, Coyoatlan 1 Univ. Nacional Autonoma de Mexico, Apdo, Mexico 17 Observatoire du Mont Megantic, Canada 5 Observatoire du Mont Megantic, Quebec 4 Observatoire du Mont Megantic, Montreal 193 Western Ontario, University, London, Canada 18 Western Ontario Univ., London, Canada 4 Western Ontario, University, London, Ontario, Canada 2 Univ. of Western Ontario, London, Canada 1 Western Ontario, University, London, CA 1 Western Ontario, University, Canada 1 Western Ontario University, London, Canada 1 Western Ontario Univ., London, Ontario, Canada 1 Western Ontario Univ., London 17 Univ. de Chile, Santiago 9 Univ. de Nice, Nice, France 7 Univ. de Chile, Santiago, Chile 5 Univ. pr., Moscow, Russia 5 UNAM, Mexico, Mexico 4 Univ. de Cantabria, Spain 3 Univ. of Kent, Kent, UK 2 Unvi. Paris, France 2 Univ. of Nigeria, Nsukka 2 Univ. di Pisa, Italy 2 Univ. Gent, Gent, Belgium 1 Univ.-Sternwarte, Munich 1 Univ.-Sternwarte, Germany 1 Univ. of Helsinki, Finland 1 Univ. of Crete, Greece 1 Univ. de Valencia, Spain 1 Univ. de Puerto Rico, Humacao 1 Univ. de Chile, Santiago, Chili 1 Univ. de Chile 1 Univ. Bern, Bern, Switzerland 1 Univ de Nice, Nice, France 1 Richmond Hill, Ontario 1 Chile, Universidad, Santiago 42 McMaster University, Hamilton, Ontario, Canada 18 McMaster Univ., Hamilton, Ontario, Canada 2 York Univ., Toronto, Ontario, Canada 2 McMaster University, Ontario, Canada 1 McMaster University, Hamilton, Ontario, Canda 1 Brandon Univ., Brandon, Ontario, Canada 20 Computer Sciences Corp., Silver Spring, Md. 6 Computer Sciences Corp., Greenbelt, Md. 1 Computer Sciences Corp., Falls Church, Va. 32 Univ. de Montreal, Montreal, Quebec, Canada 10 Univ. de Montreal, Montreal, Canada 5 Univ. of Montreal, Montreal, Quebec, Canada 4 Univ. de Montreal, Quebec, Canada 2 Univ. de Montreal, Montreal, QC, Canada 1 Univ. de Montreal, Montreal, BC, Canada 38 Univ. of Virginia, Charlottesville, VA, US 4 Virginia Univ., Charlottesville, VA, US 1 Univ. of Virginia, Charlottsville, VA, US 1 Univ. of Virginia, Charlottesvill, VA, US 1 Univ. of Virgina, Charlottesville, VA, US 65 Univ. of Wisconsin, Madison, WI, US 34 University of Wisconsin, Madison, WI, US 32 Univ. of Wisconsin-Madison, Madison, WI, US 7 University of Wisconsin-Madison, Madison, WI, US 3 University of Wisconsin, Madison, Wisconsin, US 3 U.W.-Madison, Madison, WI, US 2 Univ. of Wisconson, La Crosse, WI, US 2 Univ. of Wisconsin, La Crosse, WI, US 2 Univ. of Wiconsin, Madison, WI, US 2 Univ. Wisconsin-Madison, Madison, WI, US 1 Univ. of Wisconsin, Eau Claire, WI, US 1 Univ. of Wiconsin-Madison, Madison, WI, US 1 Univ. of Madison - Wisconsin, Madison, WI, US 1 Univ of Wisconsin-Madison, Madison, WI, US 30 Athens, National Observatory, Greece 8 Athens, National Observatory, Athens, Greece 4 Athens, National University, Greece 1 National Observatory, Greece 1 Athens, National Observatory 1 Athens National Observatory, Greece 59 Inst. for Advanced Study, Princeton, NJ 1 Inst. for Advanced Study 1 Inst. for Advanced Studies, Princeton, NJ 441 Palomar Observatory, Pasadena, CA 291 Hale Observatories, Pasadena, Calif. 163 Lick Observatory, Santa Cruz, Calif. 37 Palomar Observatory, Pasadena, Calif. 8 Big Bear Solar Observatory, Pasadena, Calif. 7 Hale Observatories, Pasadena, CA 1 Polomar Observatory, Pasadena, CA 1 Palomar Observatory, Pasadena,CA 1 Palomar Observatory Pasadena, CA 1 Mount Wilson Observatory, Pasadena, Calif. 1 Hale Observatories, Berkeley, Calif. 17 Vanderbilt Univ., Nashville, TN, US 12 Vanderbilt University, Nashville, TN, US 12 Tennessee State Univ., Nashville, TN, US 2 Vanerbilt University, Nashville, TN, US 2 Vanderbuilt Univ., Nashville, TN, US 2 Valparaiso Univ., Valparaiso, IN, US 2 Alabama Univ., Huntsville, AL, US 1 Vanderbilt Univ., Nahville, TN, US 1 Tennessee Sate Univ., Nashville, TN, US 40 Iowa, University, Iowa City, Iowa 27 Osaka University, Toyonaka, Japan 22 Hokkaido University, Sapporo, Japan 15 Tokyo, University, Mitaka, Japan 12 Osaka University, Osaka, Japan 8 Tokai University, Hiratsuka, Japan 7 Keio University, Yokohama, Japan 5 Tokyo Gakugei University, Koganei, Japan 5 Osaka University of Education, Japan 5 Nagoya University, Toyokawa, Japan 5 Kyushu University, Fukuoka, Japan 3 Tokyo, University, Sagamihara, Japan 3 Shizuoka University, Shizuoka, Japan 2 Toyama University, Toyama, Japan 2 Toyama University, Takaoka, Japan 2 Osaka University, Toyonaka, Osaka, Japan 2 Niigata University, Niigata-shi, Japan 2 Kinki University, Osaka, Japan 2 Kagoshima University, Kagoshima, Japan 2 Hiroshima University, Takehara, Japan 2 Dokkyo University, Soka, Japan 1 Tokyo, University, Tanashi, Japan 1 Tokyo University, Tokyo, Japan 1 Teikyo University, Utsunomiya, Japan 1 Niigata University, Ikarashi, Japan 1 Nagoya University, Chikusa-ku, Japan 1 Nagoya University, Chikusa, Japan 1 Kinki University, Higashi, Japan 1 Hosei University, Koganei, Japan 1 Hokkaido University, Sapporo 060, Japan 1 Hokkaido University, Sappora, Japan 1 Hokaido University, Sapporo, Japan 1 Hiroshima University, Hiroshima, Japan 1 Hirosaki University, Hirosaki, Japan 1 Ehime University, Matsuyama, Japan 62 Harvard University, Cambridge, MA 33 Harvard University, Cambridge, Mass. 19 Howard University, Washington, DC 15 Kansas, University, Lawrence, KS 9 Harvard University, Cambridge, MA, US 9 Harvard Univ., Cambridge, MA, US 9 Harvard College Observatory, Cambridge, MA 7 Harvard Univ., Cambridge, MA 5 Harvard-Smithsonian, Cambridge, MA, US 4 Oakland University, Rochester, MI 4 Kansas, University, Lawrence, Kan. 3 Oxford University, Oxford, UK 3 Cambridge University, Cambridge 1 Howard University, Washington 1 Emory University, Oxford, GA 1 Cambridge University, Cambridge, UK 1 Cambridge University, Cambridge, MA 1 Brown University, Providence, RI 1 Alaska, University, Fairbanks, AK 99 Rice University, Houston, TX 50 Rice University, Houston, Tex. 26 Boston Univ., Boston, MA, US 20 Rice Univ., Houston, TX, US 16 Boston University, Boston, MA, US 14 Texas Univ., Austin, TX, US 13 Rutgers Univ., Piscataway, NJ, US 13 Rice Univ., Houston, TX 11 Indiana Univ., Bloomington, IN, US 9 Wisconsin Univ., Madison, WI, US 8 Rice University, Houston, TX, US 6 Wesleyan Univ., Middletown, CT, US 3 Drake Univ., Des Moines, IA, US 3 Brown Univ., Providence, RI, US 2 Iowa Univ., Iowa City, IA, US 2 Indiana Univ., South Bend, IN, US 1 Widener Univ., Chester, PA, US 1 Toledo Univ., Toledo, OH, US 1 Steward Univ., Tucson, AZ, US 1 Rice University, Houston, Texas, US 1 Maine Univ., Orono, ME, US 1 Lehigh Univ., Bethlehem, PA, US 1 Drew Univ., Madison, NJ 1 Drake Univ., Des Moines, IA 1 Crete Univ., Heraklion, Greece 1 Chicago Univ., Urbana, IL, US 1 Brandeis Univ., Boston, MA, US 1 Boston, Univ., Boston, MA, US 17 Specola Vaticana, Vatican City State 3 Specola Vaticana, Vatican City 1 Specola Vaticana Castel Gandolfo, Vatican City State 60 Center for Astrophysics, Cambridge, MA, US 4 Center for Space Research, Cambridge, MA, US 3 MIT Center for Space Research, Cambridge, MA, US 26 Space Research Institute, Moscow, Russia 8 Space Research Inst., Moscow, Russia 6 Lebedev Physical Institute, Moscow, Russia 4 State Astronomical Institute, Moscow, Russia 39 Bartol Research Institute, Newark, DE 14 Bartol Research Inst., Newark, DE 8 Bartol Research Foundation, Newark, DE 17 National Research Council, Victoria, BC, Canada 8 National Research Council of Canada, Victoria, BC, Canada 4 National Research Council of Canada, Ottawa, Canada 3 National Research Council, Ottawa, Canada 3 National Research Council of Canada, Ottawa 2 National Research Council, Victoria, Canada 1 National Research Council, Victoria, BC, CA 1 National Research Council, Victoria, B.C., Canada 1 National Research Council, Ottawa, Ontario, Canada 1 National Research Council, British Columbia, Canada 1 National Research Council of Canada, Victoria, BC, CA 1 National Research Council of Canada 22 Observatoire du Mont Megantic 5 Observatoire Astronomique du Mont Megantic 3 Observatoire de Lyon, France 3 Observatoire Midi-Pyrenees 1 Osservatorio di Brera 1 Observatorio Felix Aguilar 1 Observatoire de Mexico, Mexico 110 Imperial College of Science and Technology, London, England 2 Imperial College of Science and Technology, London 57 Australia Telescope National Facility, Epping 22 CSIRO, Australia Telescope National Facility, Epping 14 Australia Telescope National Facility, Epping, Australia 11 Australia Telescope National Facility, Epping, NSW, Australia 3 The Australia Telecope National Facility, Epping, Australia 3 CSIRO, Australia Telescope National Facility, Parkes 3 Australia Telescopes National Faciltiy, Epping, Australia 3 Australia Telescope National Facility, Parkes 2 Australian Telescope National Facility, Epping, Australia 2 Australia Telescope National Facility, Narrabri 1 Australia Telescope National Facility, Narrabi 1 Australia Telescope National Facility, Epping NSW, Australia 31 Los Alamos National Lab., NM 1 Oak Ridge National Lab., TN 1 Los Alamos National Lab. 23 University of Illinois at Urbana-Champaign, Urbana, IL, US 17 Univ. of Illinois at Urbana-Champaign, Urbana, IL, US 3 Univ. of Illinois at Urgana-Champaign, Urbana, IL, US 2 University of Illinois, Champaign, Urbana, IL, US 2 Ilinois Univ. at Urbana-Champaign, Urbana, IL, US 1 University of Illinois-at Urbana Champaign, Urbana, Illinois, US 23 Universities Space Research Association, Greenbelt, MD 9 Universities Space Research Association, Washington, DC, US 8 Universities Space Research Association, Columbia, MD 7 Universities Space Research Association, Washington, DC 2 Universities Space Research Association, Huntsville, AL, US 2 Universities Space Research Association, Huntsville, AL 2 Universities Space Research Association, Greenbelt, MD, US 2 Universities Space Research Association, Columbia, MD, US 1 University Space Research Association, Greenbelt, MD 1 University Research Foundation, Greenbelt, MD 1 Universities Space Research Association, Seabrook, MD, US 1 Universities Space Research Association, Flagstaff, AZ 1 Universities Space Research Association, Chicago, IL, US 22 NASA, Infrared Telescope Facility, Mauna Kea, HI 3 NASA, Infrared Telescope Facility, Hilo, HI 2 NASA, Infrared Telescope Facility, Honolulu, HI 1 NASA, Infrared Telescope Facility, Mauna Kea 1 NASA, Infrared Telescope Facility, Hilo 1 NASA Infrared Telescope Facility, HI, US 25 Univ. College, London, United Kingdom 12 Univ. College London, London, UK 9 London, Univ. College, Dorking, United Kingdom 6 London Univ. College, Dorking, United Kingdom 4 Univ. College London, Surrey, UK 3 Univ. College, Cardiff, United Kingdom 3 Univ. College London, Holmbury, UK 2 University College, London, United Kingdom 2 Goldsmiths' College, London, United Kingdom 1 Univ. of Wales, Cardiff, United Kingdom 1 Univ. College of Wales, Cardiff, United Kingdom 1 Univ. College London, London, England, UK 1 Univ. Coll. London, London, UK 1 London Univ. Coll., Dorking, United Kingdom 1 Churchill College, Cambridge, United Kingdom 17 Nanjing University, Nanjing, People's Republic of China 4 Beijing Normal University, Beijing, People's Republic of China 2 Fudan University, Shanghai, People's Republic of China 2 Beijing University, Beijing, People's Republic of China 1 Zhongshan University, Guangzhou, People's Republic of China 33 New South Wales, University, Kensington, Australia 10 New South Wales Univ., Kensington, Australia 3 New South Wales, University, Kensington 3 New South Wales, University, Canberra, Australia 3 New South Wales, University, Campbell, Australia 3 New South Wales Univ., Canberra, Australia 1 New South Wales, University, Sydney, Australia 25 Observatoire Astronomique du Mont Megantic, Quebec, Canada 10 Observatoire Astronomique du Mont Megantic, Montreal, Canada 2 Observatoire Astronomique du Mont Megantic, Quebec 2 Observatoire Astronomique du Mont Megantic, Megantic, Quebec, Canada 1 Observatoire Astronomique du Mont Megantique, Quebec, Canada 1 Observatoire Astronomique du Mont Megantic Quebec, Canada 1 Observatoire Astronomique de Mont Megantic, Montreal, Canada 41 Michigan State University, East Lansing, Mich. 1 Michigan State University, Lansing, Mich. 1 Michigan State University, E. Lansing, Michigan, US 56 Computer Sciences Corp., Greenbelt, MD 32 Computer Sciences Corp., Silver Spring, MD 30 Computer Sciences Corp., Baltimore, MD 5 Computer Sciences Corp., El Segundo, CA 4 Computer Sciences Corp., Silver Spring 4 Computer Sciences Corp., Falls Church, VA 3 Computer Sciences Corp., Seabrook, MD 3 Computer Science Corp., Greenbelt, MD 2 Computer Sciences Corp., Beltsville, MD 1 Computer Sciences Corp., Lanham, MD, US 1 Computer Sciences Corp., Greenbelt, MD, US 1 Computer Sciences Corp., Baltimore, MD, US 1 Computer Science Corp., Silver Spring, MD 1 Computer Science Corp., Baltimore, MD 64 Rensselaer Polytechnic Institute, Troy, NY 21 Rensselaer Polytechnic Institute, Troy, N.Y. 7 Rensselaer Polytechnic Inst., Troy, NY, US 7 Rensselaer Polytechnic Inst., Troy, NY 5 Rensselaer Polytechnic Institute, Troy, NY, US 4 Rennselaer Polytechnic Institute, Troy, NY 1 Rensselaer Polytechnic Institute, Troy, New York, US 1 Rensselaer Polytechnic Institute, Troy 1 Polytechnic Institute, Troy, NY, US 27 Ecole Polytechnique, Palaiseau, Essonne, France 20 Ecole Polytechnique, Palaiseau, France 3 Ecole Polytechnique, Palaiseau, Essonne 84 Koenigstuhl, Landessternwarte, Heidelberg, West Germany 7 Landessternwarte, Heidelberg, West Germany 4 Konigstuhl, Landessternwarte, Heidelberg, West Germany 4 Koenigsstuhl, Landessternwarte, Heidelberg, West Germany 2 Koenigstuhl Landessternwarte, Heidelberg, West Germany 1 Koenigstuhl, Laudessternwarte, Heidelberg, West Germany 1 Koenigstuhl, Landesternwarte, Heidelberg, West Germany 73 Sterrewacht Sonnenborgh, Utrecht, Netherlands 28 Sterrewacht Leiden, Leiden, Netherlands 24 SRON-Leiden, Leiden, Netherlands 7 Sterrewacht Leiden, Leiden, The Netherlands 4 Sterrewacht, Leiden, Netherlands 3 Sterrwacht Leiden, Leiden, Netherlands 1 University of Leiden, Leiden, Netherlands 1 Sterrewacht Leiden, Netherlands 1 Sterrewacht Leiden, Leiden, Germany 22 Franklin Institute, Bartol Research Foundation, Newark, DE 11 Franklin Institute, Bartol Research Foundation, Newark, Del. 10 Franklin Institute, Bartol Research Foundation, Swarthmore, Pa. 1 Franklin Institute, Bartol Research Foundation, Wilmington, Del. 1 Franklin Institute Bartol Research Foundation, Swarthmore, Pa. 34 Joint Inst. for Lab. Astrophysics, Boulder, CO 9 Joint Inst. for Lab. Astrophysics 68 Belfast, Queen's University, Belfast, Northern Ireland 5 Queen's University, Belfast, Northern Ireland 2 The Queen's University of Belfast, Northern Ireland, UK 1 Belfast, Queens University, Belfast, Northern Ireland 41 Berlin, Technische Universitaet, Berlin, West Germany 13 Berlin, Technische Universitaet, West Germany 3 Muenchen, Technische Universitaet, Munich, West Germany 3 Berlin, Technische Universitat, Berlin, West Germany 3 Berlin, Freie Universitaet, Berlin, West Germany 2 Technische Universitat Berlin, Berlin, Germany 2 Hannover, Technische Universitaet, Hanover, West Germany 1 Berlin, Humboldt-Universitaet, Berlin, East Germany 1 Berlin Technische Universitaet, Berlin, West Germany 47 Wuerzburg, Universitaet, Wuerzburg, West Germany 11 Muenchen, Universitaet, Munich, West Germany 9 Muenster, Universitaet, Muenster, West Germany 4 Konstanz, Universitaet, Konstanz, West Germany 2 Stuttgart, Universitaet, Stuttgart, West Germany 2 Hannover, Universitaet, Hanover, West Germany 2 Giessen, Universitaet, Giessen, West Germany 1 Wuerzbuerg, Universitaet, Wuerzburg, West Germany 1 Rostock, Universitaet, Rostock, East Germany 1 Muenster University, Muenster, Germany 1 Muenchen, Universitaet, Munich, Germany 120 Bonn, Universitaet, Bonn, West Germany 56 Koeln, Universitaet, Cologne, West Germany 34 Bonn, Universitaet, West Germany 26 Bern, Universitaet, Switzerland 25 Heidelberg, Universitaet, West Germany 20 Tuebingen, Universitaet, West Germany 20 Oslo, Universitetet, Norway 14 Oslo, Universitetet, Oslo, Norway 12 Lund, Universitet, Lund, Sweden 9 Bonn, Univ., Sternwarte, Germany 8 Wuerzburg, Universitaet, West Germany 8 Basel, Universitaet, Switzerland 7 Mons, Universite, Mons, Belgium 6 Tromso, Universitetet, Norway 6 Muenster, Universitaet, West Germany 6 Lodz, Uniwersytet, Lodz, Poland 6 Bonn, Universitaet, Sternwarte, West Germany 5 Lausanne, Universite, Switzerland 4 Lund, Universitet, Sweden 3 Muenster, Universitaet, Germany 3 Mainz, Universitaet, West Germany 3 Kiel, Universitaet, West Germany 3 Kiel, Universitaet, Kiel, West Germany 3 DFVLR, Wessling, West Germany 3 Cluj, Universitatea, Cluj, Rumania 2 Mainz, Universitaet, Mainz, West Germany 2 Jena, Universitaets-Sternwarte, Germany 2 Goettingen, Universitaet, West Germany 2 Aarhus Universitet, Arhus, Denmark 1 Tuebingen, Univesitaet, West Germay 1 Tuebingen, Universitat, West Germany 1 Tuebingen, Universitaet, Germany 1 Sternwarte, Kiel, West Germany 1 Koen, Universitaet, Cologne, West Germany 1 Koeln, Universitaet, Cologne 1 Jena, Universitaet, Germany 1 Jena, Univ.-Sternwarte, Germany 1 ESO, Garching, West Germany 1 ESA Porz-Wahn, West Germany 1 Bonn, Universitat, Bonn, West Germany 1 Bonn, Universitaet,, Bonn, West Germany 1 Bonn, Universitaet, Bonn 1 Bochum, Sternwarte, West Germany 1 Bern, Universitat, Switzerland 1 Basel Universitaet, Switzerland 96 Basel, Universitaet, Binningen, Switzerland 10 Zuerich, Universitaet, Zurich, Switzerland 9 Basel, Universitaet, Basel, Switzerland 7 Univ. Basel, Binningen, Switzerland 7 Basel Univ., Binningen, Switzerland 6 Bern, Universitaet, Berne, Switzerland 3 Universitat Basel, Binningen, Switzerland 1 Geneve, Universite, Geneva, Switzerland 1 Basel, Universitaet,, Binningen, Switzerland 1 Basel, Universitaet, Benningen, Switzerland 1 Basel Universitaet, Basel, Switzerland 50 New Mexico Institute of Mining and Technology, Socorro 15 New Mexico Inst. of Mining and Technology, Socorro 14 New Mexico Institute of Mining and Technology, Socorro, N. Mex. 8 New Mexico Institute of Mining and Technology, Socorro, NM 5 New Mexico Institute of Mining and Technology 3 New Mexico Institute of Mining and Technology, Socorro, NM, US 2 New Mexico Institute of Mining and Technology, Soccoro 1 New Mexico Institute for Mining and Technology, Socorro 1 New Mexico Instituite of Mining and Technology, Socorro 1 New Mexico Inst. of Mining and Technology, Socorro, NM, US 1 New Mexico Inst. of Mining and Technology 236 Leiden, Rijksuniversiteit, Sterrewacht, Leiden, Netherlands 6 Leiden, Rijksuniversiteit Sterrewacht, Leiden, Netherlands 2 Leiden, Rijksuniversitet, Sterrewacht, Leiden, Netherlands 2 Leiden, Rijksuniversiteit, Sterrenwacht, Leiden, Netherlands 2 Leiden Rijksuniversiteit, Sterrewacht, Leiden, Netherlands 1 Leiden, Rijksuniversiteit, Sterewacht, Leiden, Netherlands 52 Dwingeloo, Radiosterrenwacht, Netherlands 28 Dwingeloo, Radiosterrenwacht, Dwingeloo, Netherlands 15 Westerbork, Radiosterrenwacht, Zwiggelte, Netherlands 14 Radiosterrenwacht, Dwingeloo, Netherlands 5 Radiosterrewacht, Dwingeloo, Netherlands 3 Dwingeloo, Radiosterrewacht, Dwingeloo, Netherlands 2 Westerbork, Radiosterrewacht, Zwiggelte, Netherlands 2 Radio Sterrewacht, Dwingeloo, Netherlands 1 Westerbork, Radiosterrewacht Zwiggelte, Netherlands 1 Westerbork, Radiosterrenwacht Zwiggelte, Netherlands 1 Dwingeloo, Radiosterrewacht, Netherlands 1 Dwingeloo Radiosterrenwacht, Netherlands 1 Dwingeloo Radiosterrenwacht, Dwingeloo, Netherlands 1 Dwingeloo Radio Observatory, Dwingeloo, Netherlands 60 Hamburger Sternwarte, Hamburg, Federal Republic of Germany 7 Remeis-Sternwarte, Bamberg, Federal Republic of Germany 2 Remeis Sternwarte, Bamberg, Federal Republic of Germany 65 Moskovskii Gosudarstvennyi Universitet, Moscow, USSR 3 Rostovskii Gosudarstvennyi Universitet, Rostov-on-Don, USSR 1 Moskovskii Gosudarstvennyi Universitet, Nauchny, Ukrainian SSR 1 Moskovskii Gosudarstvennyi Universitet, Moscow, Russia 1 Moskovskii Gosudarstvennyi Universitet, Moscow 1 Moskovskii Gosudarstvennyi Institut, Moscow, USSR 1 Kazanskii Gosudarstvennyi Universitet, Kazan, USSR 1 Gor'kovskii Gosudarstvennyi Universitet, Gorki, USSR 97 Minnesota, University, Minneapolis, MN 84 Minnesota, University, Minneapolis, Minn. 3 Tennessee, University, Knoxville, Tenn. 1 Minnesota, University, Minneapolis, Min. 1 Minnesota University, Minneapolis, Minn. 41 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg im Breisgau, Federal Republic of Germany 2 Kiepenheuer Institut fuer Sonnenphysik, Freiburg im Breisgau, Federal Republic of Germany 1 Kipenheuer-Institut fuer Sonnenphysik, Freiburg im Breisgau, Federal Republic of Germany 1 Kiepenheuer-Institut fuer Sonnenphysik, Frieburg im Breisgau, Federal Republic of Germany 1 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg, Federal Republic of Germany 1 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg im Briesgau, Federal Republic of Germany 48 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg im Breisgau, West Germany 14 Kiepenheuer-Inst. fuer Sonnenphysik, Freiburg im Breisgau, Germany 5 Kiepenheuer Institut fuer Sonnenphysik, Freiburg im Breisgau, West Germany 3 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg-im-Breisgau, West Germany 1 Kiepenheur-Institut fuer Sonnenphysik, Freiburo im Breisqau, West Germany 1 Kiepenheur-Institut fuer Sonnenphysik, Freiburg im Breisgau, West Germany 1 Kiepenheuerinstitut fuer Sonnenphysik, Freiburg im Breisgau, West Germany 1 Kiepenheuer-Institut, fuer Sonnenphysik, Freiburg im Breisgau, West Germany 1 Kiepenheuer-Institut fur Sonnenphysik, Freiburg im Breisgau, West Germany 1 Kiepenheuer-Institut fuer Sonnephysik, Freiburg im Breisgau, West Germany 1 Kiepenheuer-Institut fuer Sonnenphysik, Freiburg im Breisgall, West Germany 1 Kiepenheuer - Institut fuer Sonnenphysik, Freiburg im Breisgau, West Germany 19 Kiel, Univ., Inst. fuer Theoretische Physik und Sternwarte, Germany 1 Kiel, Univ., Inst. fuer Theoretische Physik und Sternwarte 292 Max-Planck-Institut fuer Physik und Astrophysik, Garching, West Germany 84 Max-Planck-Inst. fuer Physik und Astrophysik, Garching, Germany 70 Max-Planck-Institut fuer Physik und Astrophysik, Munich, West Germany 4 Max-Planck-Institut fuer Physik and Astrophysik, Garching, West Germany 2 Max-Planck-Institut fur Physik und Astrophysik, Munich, West Germany 2 Max-Planck-Institut fur Physik und Astrophysik, Garching, West Germany 1 Max-Planck-Institute fuer Physik und Astrophysik, Garching, West Germany 1 Max-Planck-Institute fuer Physik und Astrophysik, Garching, Germany 1 Max-Planck-Institut fur Physik and Astrophysik, Garching, West Germany 1 Max-Planck-Institut fuer Physik und Astrophysik, Muenchen, Germany 1 Max-Planck-Institut fuer Physik und Astrophysik, Garching, Germany 1 Max-Planck-Institut fuer Physik und Astrophysik Garching, West Germany 1 Max-Planck-Institut fuer Physik and Astrophysik, Munich, West Germany 1 Max-Planck-Inst. fuer Physik und Astrophysik, Munich, Germany 1 Max-Planck Institut fuer Physik und Astrophysik, Garching, West Germany 33 Osservatorio Astrofisico di Arcetri, Firenze, Italy 5 Osservatorio Astrofisico di Catania, Catania, Italy 4 Osservatorio Astrofisica di Arcetri, Firenze, Italy 3 Osservatorio Astrofisica di Catania, Catania, Italy 3 Astrofisico di Arcetri, Firenze, Italy 2 Osservatorio di Arcetri, Firenze, Italy 2 Osservatorio Astrofisico di Arcetri, Firenze, Germany 2 Osservatorio Astrofisco di Catania, Catania, Italy 1 Osservatorio Astrofisico di Aretri, Firenze, Italy 1 Osservatorio Astrofisico di Arcetri, Florence, Italy 1 Osservatorio Astrofisco di Arcetri, Firenze, Italy 1 Osservatorio Astrofiscio di Arcetri, Firenze, Italy 18 Center for High Energy Astrophysics, Netherlands 10 Center for High-Energy Astrophysics, Netherlands 6 Centre for High Energy Astrophysics, Netherlands 4 Center for High Energy Astrophysics, Amsterdam, Netherlands 3 Centre for High-Energy Astrophysics, Netherlands 2 Center for High Energy Astrophysics 1 Centre for High-energy Astrophysics, Netherlands 1 Center for High-Energy Astrophysics, Amsterdam, Netherlands 1 Center for High-Energy Astrophysics, Amsterdam 1 Center for High Energy Astrophysics, Amsterdam 143 Joint Institute for Laboratory Astrophysics, Boulder, Colo. 1 Joint Institute for Laboratory Physics, Boulder, Colo. 1 Joint Institute for Laboratory Astrophysics, Boulder Colo. 34 Universidad Nacional Autonoma de Mexico, Mexico City 7 Universidad Nacional Autonoma de Mexico, Mexico 4 Universidad Nacional Autonoma de Mexico, Ensenada 4 Universidad Nacional Autonoma de Mexico, Alvaro Obregon 1 Universidad Nacional Autonoma de Mexico Mexico City 1 Universidad Nacional Autonoma de Mexi 23 International Centre for Theoretical Physics, Trieste, Italy 10 International Center for Theoretical Physics, Trieste, Italy 5 International Centre for Theoretical Physics 1 International Centre for Theoretical Astrophysics, Italy 21 CNR, Gruppo Nazionale per l'Astronomia, Padua, Italy 4 CNR, Gruppo Nazionale per l'Astronomia, Padua 3 CNR, Gruppo Nazionale per l'Astronomia, Florence, Italy 3 CNR, Gruppo Nazionale per l'Astronomia, Catania, Italy 3 CNR, Gruppo Nazionale di Astronomia, Padua, Italy 1 CNR, Gruppo Nazionale per l'Astronomia, Rome, Italy 1 CNR, Gruppo Nazionale per l'Astronomia, Naples, Italy 228 CNR, Istituto di Astrofisica Spaziale, Frascati, Italy 67 CNR, Laboratorio di Astrofisica Spaziale, Frascati, Italy 44 CNR, Ist. di Astrofisica Spaziale, Frascati, Italy 10 CNR, Istituto Astrofisica Spaziale, Frascati, Italy 5 Istituto di Astrofisica Spaziale (CNR), Frascati, Italy 4 Istituto Astrofisica Spaziale, Frascati, Italy 3 Istituto di Astrofisica Spaziale, CNR, Frascati, Italy 3 CNR, Istituto de Astrofisica Spaziale, Frascati, Italy 2 Istituto di Astrofisica Spaziale, Frascati, Italy 2 Instituto di Astrofisica Spaziale, Frascati, Italy 2 Instituo Astrofiscia Spaziale, Frascati, Italy 2 CNR, Istituto di Astrofisica Spatiale, Frascati, Italy 2 CNR, Instituto di Astrofisica Spaziale, Frascati, Italy 1 Istituto di Astrofisica Spaziale, Franscati, Italy 1 Istituto di Astrofisica Spaziale CNR, Frascati, Italy 1 Istituto di Astrofiscia Spaziale, Frascati, Italy 1 Istituto Astrofisica Spaziale, CNR, Frascati, Italy 1 Instituto de Astrofisica Spaziale, Franscati, Italy 1 CNR, Laboratorio di Astrofisca Spaziale, Frascati, Italy 1 CNR, Laboratorio Astrofisica Spaziale, Frascati, Italy 1 CNR, Istituto di Astrofisica Spaziole, Frascati, Italy 1 CNR, Istituto di Astrofisica Spatiale Frascati, Italy 1 CNR, Istituto di Astrofiscia Spaziale, Frascati, Italy 1 CNR, Istituto di Astrifisica Spaziale, Frascati, Italy 1 CNR, Istituto Plasma Spazio, Frascati, Italy 1 CNR Istituto di Astrofisica Spaziale, Frascati, Italy 82 NASA, Ames Research Center, Moffett Field 52 NASA, Ames Research Center, Moffett Field, Calif. 29 Koeln, Universitaet, Cologne, Federal Republic of Germany 21 Universitaets-Sternwarte, Munich, Federal Republic of Germany 18 Bonn, Universitaet, Sternwarte, Federal Republic of Germany 13 Universitaets-Sternwarte, Bonn, Federal Republic of Germany 7 Universitaets-Sternwarte, Jena, Federal Republic of Germany 6 Muenchen, Universitaets-Sternwarte, Munich, Federal Republic of Germany 6 Bonn, Universitaets-Sternwarte, Federal Republic of Germany 4 Goettingen, Universitaets-Sternwarte, Federal Republic of Germany 2 Sonneberg, Sternwarte, Federal Republic of Germany 1 Universitaets Sternwarte, Bonn, Federal Republic of Germany 1 Muenchen, Universitaetssternwarte, Munich, Federal Republic of Germany 1 Muenchen, Universitaet, Sternwarte, Munich, Federal Republic of Germany 1 Kiel, Universitaets-Sternwarte, Federal Republic of Germany 1 Hamburg, Universitaet, Sternwarte, Federal Republic of Germany 1 Goettingen, Universitaetssternwarte, Federal Republic of Germany 70 National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa 27 National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa, Canada 15 National Research Council of Canada, Herzberg Inst. of Astrophysics, Ottawa 2 National Research Council of Canada, Herzberg Institute for Astrophysics, Ottawa, Canada 1 National Research Council of Canada, Merzberg Institute of Astrophysics, Ottawa, Canada 1 National Research Council of Canada, Herzberg Inst. for Astrophysics, Ottawa 1 National Research Council of Canada, Hertzberg Institute of Astrophysics, Ottawa, Canada 34 Indian Inst. of Astrophysics, Bangalore, India 6 Indian Inst. of Science, Bangalore, India 1 Indian Inst. of Astrophysics, Koramangala, Bangalore, India 1 Indian Inst. of Astrophysics, Bangalore 25 Instituto Argentino de Radioastronomia, Villa Elisa, Argentina 18 CONICET, Instituto Argentino de Radioastronomia, Villa Elisa, Argentina 4 CONICET, Instituto Argentino de Radioastronomia, Villa Elisa 3 Inst. Argentino de Radioastronomia, Villa Elisa, Argentina 1 Instituto Argentino di Radioastronomia, Villa Elisa, Argentina 1 CONYCET, Instituto Argentino de Radioastronomia, Villa Elisa, Argentina 1 CONICET, Instituto Argentino de Radioastronomia, Villa Elisa, Angentina 1 CONICET, Instituto Argentino de Radioastronomia, Vila Elisa, Argentina 1 CONICET, Instituto Argentino de Radioastromia, Villa Elisa, Argentina 1 CONICET, Instituto Argentina de Radioastronomia, Villa Elisa, Argentina 19 Ceskoslovenska Akademie Ved, Astronomicky Ustav, Ondrejov, Czechoslovakia 9 Ceskoslovenska Akademie Ved, Astronomicky Ustav, Prague, Czechoslovakia 1 Ceskoslovenska Akademie Ved, Astronomicky Ustav, Tatranska Lomnica, Czechoslovakia 1 Ceskolovenska Akademie Ved, Astronomicky Ustav, Ondrejov, Czechoslovakia 100 Polska Akademia Nauk, Centrum Astronomiczne, Warsaw, Poland 28 Polska Akademia Nauk, Centrum Astronomiczne, Torun, Poland 6 Polska Akademia Nauk, Centrum Badan Kosmicznych, Warsaw, Poland 3 Polska Akademia Nauk, Instytut Astronomiczny, Warsaw, Poland 2 Polska Akademia Nauk, Centrum Badan Kosmicznych, Wroclaw, Poland 1 Polska-Akademia Nauk, Centrum Astronomiczue, Torun, Poland 1 Polska Akademia Nauk, Instytut Astronomiczny, Torun, Poland 1 Polska Akademia Nauk, Instytut Astronomiczmy, Warsaw, Poland 1 Polska Akademia Nauk, Centrum Badan Kosmicznykh Warsaw, Poland 1 Polska Akademia Nauk, Centrum Astronomiczne, Wasraw, Poland 1 Polska Akademia Nauk, Centrum Astronomiczne, Warszawa, Poland 1 Polska Akademia Nauk Centrum Astronomiczne, Warsaw, Poland 139 Manchester, Victoria University, Jodrell Bank, Ches., England 136 Manchester, Victoria University, Jodrell Bank, England 3 Manchester, Victoria University, Macclesfield, Ches., England 2 Manchester, Victoria, University, Jodrell Bank, Ches., England 2 Manchester, University, Jodrell Bank, England 1 lManchester, Victoria University, Jodrell Bank, Ches., England 1 Manchester, Victoria University, Manchester and Jodrell Bank, Ches., England 1 Manchester, Victoria University, Jordell Bank, England 129 Weizmann Institute of Science, Rehovot, Israel 4 Weizmann Inst. of Science, Rehovot, Israel 2 Weizmann Istitute of Science, Rehovot, Israel 1 Weizmann Institute, Rehovot, Israel 1 Weizmann Institute of Science Rehovot, Israel 72 CEA, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette, France 17 Centre d'Etudes de Saclay, Gif-sur-Yvette, France 14 Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette, France 3 Centre d'Etudes Nucleaires de Saclay, Gif sur Yvette, France 2 Centre d'Etude Nucleaires de Saclay, Gif-sur-Yvette, France 2 CEA, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette 1 CNRS, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette, France 1 CEA, Centre d'Etudes Nucleaires de Saclay, Gif-Sur-Yvette, France 1 CEA, Centre d'Etudes Nucleaires de Saclay, France 99 Canadian Institute for Theoretical Astrophysics, Toronto, Canada 25 Canadian Inst. for Theoretical Astrophysics, Toronto, Canada 4 Canadian Institute of Theoretical Astrophysics, Toronto, Canada 3 Canadian Inst. for Theoretical Astrophysics, Canada 2 Canadian Institute for Theoretical Astrophysics, Toronto, Ontario, Canada 2 Canadian Institute for Theoretical Astrophysics, Canada 2 Canadian Inst. for Theoretical Astrophysics, Toronto, Ontario, Canada 1 Canadian Institute for Theoretical Astrophysics, Toronto 1 Canadian Inst. for Theoretical Astrophysics, Toronto 85 Osservatorio Astronomico di Capodimonte, Naples, Italy 19 Osservatorio Astronomico Universitario, Bologna, Italy 17 Osservatorio Astronomico di Padova, Padova, Italy 14 Osservatorio Astronomico di Bologna, Bologna, Italy 8 Osservatorio Astronomico di Roma, Roma, Italy 6 Osservatorio Astronomico di Capodimonte, Napoli, Italy 3 Osservatorio Astronomico di Padova, Asiago, Italy 3 Osservatario Astronomico di Bologna, Bologna, Italy 2 Osservatorio Astronomica di Capodimonte, Napoli, Italy 1 Osservatorio Astronomico di Pavdova, Padova, Italy 1 Osservatorio Astronomico di Padova, Sede di Asiago, Italy 1 Osservatorio Astronomico di Padova, Italy 1 Osservatorio Astronomico de Capodimonte, Naples, Italy 1 Osservatorio Astron. di Bologna, Bologna, Italy 1 Osservartorio Astronomico di Padova, Italy 1 Observatario Astronomico di Padova, Padova, Italy 557 Observatorio Interamericano de Cerro Tololo, La Serena, Chile 8 Observatorio Interamericano de Cerro Tololo, La Serena 3 Observatorio Interamericano de Cerro-Tololo, La Serena, Chile 1 Obsevatorio Interamericano de Cerro Tololo, La Serena, Chile 1 Observatorio interamericano de Cerro Tololo, La Serena, Chile 1 Observatorio Intermericano de Cerro Tololo, La Serena, Chile 1 Observatorio Interamericano de Cerro, Tololo, La Serena, Chile 1 Observatorio Interamericano de Cerro Totolo, La Serena, Chile 1 Observatorio Interamericano de Cerro Tololo, la Serena, Chile 1 Observatorio Interamericano de Cerro Tololo, Tucson, Ariz. 1 Observatorio Interamericano de Cerro Tololo, Tucson, AZ 1 Observatorio Interamericano de Cerro Tololo, La Serene, Chile 1 Observatorio Interamericano de Cerro Tololo la Serena, Chile 1 Observatorio Interamericano de Cerro Telolo, La Serena, Chile 1 Observatorio Interamericano de Cerro Talolo, La Serena, Chile 1 Observatorio Interamericano de Cerra Tololo, La Serena, Chile 1 Observatorio Astronomico de Cerro Tololo, La Serena, Chile 1 Observatorio Astronomico de Cerro Tololo, La Serena 37 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK 8 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT 4 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking RH5 6NT 4 Mullard Space Science Laboratory, University College London, Holmbury Saint Mary, Dorking, Surrey RH5 6NT, UK 3 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking RH5 6NT, Surrey, UK 1 Mullard Space Science Laboratory, University College London, Holmbury StMary, Dorking, Surrey RH5 6NT 1 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking RH5 6NT, UK 34 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT 30 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK 9 Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT 1 Dept. of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK 1 Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK 84 Onsala Rymdobservatorium, Sweden 3 Onsala Rymdobservatorium 1 Onsala Rymdoobservatorium, Sweden 1 Onsala Rymdobervatorium, Sweden 118 Yale University, New Haven, CT 38 Yale University, New Haven, Conn. 37 Yale Univ., New Haven, CT, US 23 Yale Univ., New Haven, CT 8 Yale University, New Haven, CT, US 3 Yale University, Yale, CT, US 3 Yale Uniersity, New Haven, CT, US 3 Tulane University, New Orleans, LA 3 Denver, University, Denver, Colo. 2 Wesleyan University, Middletown, Conn. 2 Drake University, Des Moines, IA, US 1 Yale University, New Haven, Connecticut, US 1 Yale University, Hew Haven, CT 1 Wesleyan Univeristy, Middletown, Conn. 1 Drake University, Des Moines, Iowa 1 Denver University, Denver, Colo. 1 Delhi, University, New Delhi, India 51 Kent, University, Canterbury, England 23 Keele, University, Keele, Staffs., England 6 Leicester University, Leicester, England 4 Kent, University, Canterbury 2 Open University, Milton Keynes, England 1 Trent University, Peterborough 1 Meerut, University, Meerut, India 1 Kent, University, England 1 Keele, University, Keel, Staffs., England 120 Firenze, Universita, Florence, Italy 108 Roma I, Universita, Rome, Italy 101 Roma, Universita, Rome, Italy 79 Torino, Universita, Turin, Italy 25 Roma II, Universita, Rome, Italy 19 Trieste, Universita, Trieste, Italy 18 Firenze, Univ., Florence, Italy 15 Lecce, Universita, Lecce, Italy 1 Venezia, Universita, Venice, Italy 1 Trento, Universita, Povo, Italy 1 Rome, Universita, Rome, Italy 1 Roma II, Universite, Rome, Italy 1 Florence Univ., Florence, Italy 1 Firenze, Universita, Arcetri, Italy 1 Firenze Universita, Florence, Italy 1 Firenza, Universita, Florence, Italy 31 La Plata, Universidad Nacional, Argentina 12 La Plata, Universidad Nacional 8 La Plata, Univ. Nacional, Argentina 7 Cordoba, Universidad Nacional, Argentina 1 La Plata, Universidad National, Argentina 1 La Plata, Universidad Nacional, La Plata, Argentina 1 La Plata, Universidad Nacional, La Plata 1 La Plata Universidad Nacional CONICET 1 Cordoba, Universidad Nacional, Cordoba, Argentina 379 Maryland, University, College Park 315 Maryland, University, College Park, Md. 225 Maryland, University, College Park, MD 77 Maryland Univ., College Park 8 Maryland Univ., College Park, MD, US 4 Maryland, University, Greenbelt, Md. 3 Maryland, University, Baltimore, MD 3 Maryland, University, Adelphi, MD 3 Maryland University, College Park, MD 2 Maryland University, College Park, Md. 1 Maryland, University, Collge Park 1 Maryland, University, College P 24 Chinese Academy of Sciences, Beijing, China 4 Chinese Academy of Sciences, Kunming, China 2 Chinese Academy of Sciences, Shanghai, China 2 Academy of Sciences, Beijing, China 1 Chinese Academy of Sciences, Nanjing, China 1 Chinese Academy of Sciences, Graduate School 72 Russian Academy of Sciences, Moscow, Russia 4 Academy of Sciences, Moscow, Russia 3 Russian Academy of Science, Nizhny Novgorod, Russia 2 Russian Academy of Sciences, St. Petersburg, Russia 2 Russian Academy of Sciences, Saint-Petersburg, Russia 2 Russian Academy of Sciences, Nizhny Arkhyz, Russia 2 Russian Academy of Science, Niznij Arhyz, Russia 2 Russian Academy of Science, Moscow, Russia 2 Bulgarian Academy of Sciences, Sofia, Bulgaria 1 Russian Academy of Sciences, Troitsk, Russia 1 Russian Academy of Sciences, Sankt-Petersburg, Russia 1 Russian Academy of Sciences, Nizhnij Novgorod, Russia 1 Russian Academy of Scienc, Moscow, Russia 1 Russian Academy Sciences, Moscow, Russia 1 Latvian Academy of Sciences, Riga, Latvia 44 Pittsburgh, University, PA 31 Pittsburgh, University, Pittsburgh, Pa. 28 Pittsburgh, University, Pittsburgh, PA 1 Carnegie-Mellon University, Pittsburgh, PA 1 Bucknell University, Lewisburg, PA 167 Kyoto University, Japan 96 Nagoya University, Japan 78 Kyoto University, Kyoto, Japan 47 Tokyo Univ., Japan 29 Nagoya Univ., Japan 27 Kyoto Univ., Japan 17 Nagoya Univ., Nagoya, Japan 16 Tohoku Univ., Sendai, Japan 16 Kyoto Univ., Kyoto, Japan 13 Kyoto University, Uji, Japan 13 Hokkaido Univ., Sapporo, Japan 12 Gifu University, Japan 11 Indiana Univ., Bloomington 10 Kyoto Univ., Uji, Japan 10 Kyoto Univ., Sakyo, Kyoto, Japan 9 Chiba University, Japan 8 Tokyo Univ., Mitaka, Japan 8 Osaka Univ., Osaka, Japan 8 Hiroshima Univ., Hiroshima, Japan 7 Sophia Univ., Tokyo, Japan 7 Kyoto Sangyo Univ., Kyoto, Japan 6 Tokyo Univ., Tokyo, Japan 6 Osaka Univ., Toyonaka, Japan 6 Kyoto Sangyo Univ., Japan 5 York Univ., Toronto, Canada 5 Yamanashi Univ., Takeda, Japan 5 Oxford Univ., Oxford, UK 5 Kyoto, University, Kyoto, Japan 4 Tokyo Gakugei Univ., Tokyo, Japan 4 Rikkyo Univ., Tokyo, Japan 4 Lodz Univ., Lodz, Poland 4 Kyushu Univ., Fukuoka, Japan 4 Kyoto, University, Japan 4 Koyoto Sangyo University, Kyoto, Japan 4 Kobe University, Japan 4 Kobe Univ., Kobe, Japan 4 Bern Univ., Switzerland 3 Toronto Univ., Toronto, Canada 3 Osaka Univ., Osdaka, Japan 3 Kokugakuin Univ., Tokyo, Japan 3 Kobe Univ., Japan 3 Kagoshima Univ., Japan 3 Basel Univ., Switzerland 2 Yukawa Inst., Kyoto Univ., Kyoto, Japan 2 Toyama Univ., Toyama, Japan 2 Tokyo Univ., Komaba, Japan 2 Tartu Univ., Estonia 2 Seikei Univ., Tokyo, Japan 2 Porto Univ., Portugal 2 Oslo Univ., Oslo, Norway 2 Ochanomizu Univ., Tokyo, Japan 2 Niigata Univ., Japan 2 Nagoya Univ., Toyokawa, Japan 2 Kyoto Univ., Uji and Kyoto, Japan 2 Kumamoto University, Japan 2 Kiev Univ., Kiev, Ukraine 2 Chili Univ., Santiago, Chile 2 Bonn Univ., Bonn, Germany 1 York Univ., Ontario, Canada 1 Waseda Univ., Tokyo, Japan 1 Waseda Univ., Okubo, Tokyo, Japan 1 Tufts Univ., Medford, MA 1 Toronto Univ., Ontario, Canada 1 Tokai Univ., Kanagawa, Japan 1 Toho Univ., Chiba, Japan 1 Tartu Univ., Tartu, Estonia 1 Shizuoka Univ., Japan 1 Oita University, Japan 1 Niigata Univ., Niigata, Japan 1 Nihon Univ., Narashino, Japan 1 Nagoya City Univ., Nagoya, Japan 1 NEC Corp., Kawasaki, Japan 1 Lisbon Univ., Portugal 1 Kyushu-Tokai Univ., Kumamoto, Japan 1 Kyushu Univ., Fukuopka, Japan 1 Kyoto University, Sakyoku, Kyoto, Japan 1 Kyoto University, Sakyo, Japan 1 Kyoto University, Kyoto and Nara, Japan 1 Kyoto University Japan 1 Kyoto Univ., Sakyo-ku, Kyoto, Japan 1 Kyoto Gakuen Univ., Japan 1 Kumamoto Univ., Japan 1 Kobe Univ., Hyogo, Japan 1 Kinki Univ., Osaka, Japan 1 Keio Univ., Hiyoshi, Japan 1 Keele Univ., Keele, UK 1 Kagoshima Univ., Kagoshima, Japan 1 Iwate Univ., Morioka, Japan 1 Hosei Univ., Koganei, Tokyo, Japan 1 Hitotsubashi Univ., Tokyo, Japan 1 Gifu Univ., Japan 1 Gifu Univ., Gifu, Japan 1 Fukui University, Japan 1 Crete Univ., Crete, Greece 1 Chiba Univ., Japan 1 Cairo Univ., Giza, Egypt 149 Arizona State University, Tempe 61 Georgia State University, Atlanta 30 San Diego State University, CA 21 Montana State University, Bozeman 16 North Carolina State University, Raleigh 10 Washington State University, Pullman 6 Montana State Univ., Bozeman 6 Appalachian State University, Boone, NC 5 Utah State University, Logan 5 Oklahoma State University, Stillwater 5 Mankato State University, MN 4 Iowa State University, Ames 3 Montana State University, Bozeman, MT 2 Wichita State University, KS 2 Wayne State University, Detroit, MI 2 San Jose State University, CA 2 Penn State University, PA, US 2 Moscow State University, Russia 2 Montana State University, Bozeman, Montana, US 2 Copenhagen University, Denmark 2 California State University, Fullerton 1 Utah, State University, Logan 1 Tokyo, Science University, Japan 1 Osaka Sangyo University, Japan 1 Montana State University, Bozeman, Mont. 1 Montana State University, Bozeman, MT, US 1 Indiana State University, Terre Haute 1 Cleveland State University, OH 1 Austin State University, TX 1 Attila Jozsef University, Szeged 1 Arizona State Universty, Tempe 1 Arizona State University, Tucson 85 Michigan, University, Ann Arbor, Mich. 1 Michigan, University, Observatory, Ann Arbor, Mich. 806 California, University, Berkeley 346 California, University, Berkeley, CA 162 California, University, La Jolla 129 California, University, La Jolla, Calif. 112 California, University, La Jolla, CA 65 California, University, Santa Cruz 54 California, University, Irvine 34 California, University, Livermore, CA 31 California, University, San Diego 31 California, University, Livermore 31 California, University, Davis 17 California, University, Irvine, CA 16 California, University, Santa Cruz, CA 15 California, University, San Diego, CA 9 California, University, Riverside 4 California University, Berkeley, CA 2 Old Dominion University, Norfolk, VA 2 California, University, Riverside, CA 2 California, University, Davis, CA 2 California, University, Berkeley and Irvine 2 California State University, Fullerton, CA 1 California, Unversity, Livermore, CA 1 California, Unversity, Berkeley, CA 1 California, University, La Jolla CA 1 California, Universita, La Jolla 1 California University, Santa Cruz 1 California University, La Jolla, CA 1 California University, Berkeley 129 Milano, Universita, Milan, Italy 59 Bologna, Universita, Bologna, Italy 54 Catania, Universita, Italy 40 Napoli, Universita, Naples, Italy 35 Catania, Universita, Catania, Italy 15 Pisa, Universita, Pisa, Italy 12 Palermo, Universita, Palermo, Italy 6 Calabria, Universita, Rende, Italy 5 Citta Universitaria, Catania, Italy 4 Perugia, Universita, Perugia, Italy 4 Pavia, Universita, Pavia, Italy 4 Jadavpur University, Calcutta, India 3 L'Aquila, Universita, L'Aquila, Italy 3 Calabria, Universita, Cosenza, Italy 2 Messina, Universita, Messina, Italy 2 Genova, Universita, Genoa, Italy 2 Catania Univ., Catania, Italy 2 Bari, Universita, Bari, Italy 1 Silesia, University, Katowice, Poland 1 Santander, University, Santander, Spain 1 Panjab University, Chandigarh, India 1 Palermo, Universit1/4a, Palermo, Italy 1 Napoli, Universit1/4a, Naples, Italy 1 Milan, Universita, Milan, Italy 1 Messina, UniversitOea, Messina, Italy 1 Istanbul, University, Istanbul, Turkey 1 Illinois, University, Chicago, Ill. 1 Citta' Universitaria, Catania, Italy 1 Catania University, Catania, Italy 1 Calcutta, University, Calcutta, India 1 Calabria, Universita, Italy 1 Calabria, Universita, Calabria, Italy 1 Cagliari, Universita, Cagliari, Italy 1 Bologna University, Bologna, Italy 109 Northwestern University, Evanston, IL 34 Northwestern Univ., Evanston, IL, US 24 Northwestern Univ., Evanston, IL 21 Northwestern University, Evanston, Ill. 19 Northwestern University, Evanston, IL, US 15 Rochester, University, Rochester, NY 5 Southwestern University, Georgetown, TX 3 Northwestern University, Evanston, Illinois, US 2 Northeastern University, Boston, MA 1 Northwestern Univeristy, Evanston, IL 1 Northwestern Univ., Evanston, Il, US 1 Northeastern Univ., Boston, MA 91 Sydney, University, Australia 87 Sydney, University, Sydney, Australia 45 Tasmania, University, Hobart, Australia 14 Queensland, University, Brisbane, Australia 12 Univ. of Sydney, Sydney, Australia 5 Melbourne, University, Melbourne, Australia 5 Adelaide, University, Adelaide, Australia 3 Melbourne, University, Australia 2 Monash University, Melbourne, Australia 1 University of Sydney, Australia 1 Sydney Univ., Sydney, Australia 1 Sofia University, Sofia, Bulgaria 1 Sidney, University, Sydney, Australia 1 Adelaide, University, Adelaide , Australia 190 Columbia University, New York 126 Columbia University, New York, NY 125 Columbia University, New York, N.Y. 44 New York University, NY 25 New York University, New York, NY 23 New York University, New York, N.Y. 9 York University, Downsview 5 Rutgers University, New Brunswick, NJ 5 Columbia, University, New York, NY 4 New York University, New York, NY, US 2 New York, City University, New York, N.Y. 1 Texas Tech University, Lubbock, TX 1 New York, University, New York, NY 1 New York, University, New York, N.Y. 1 New York University, New York 1 Columbia, University, New York, N.Y. 1 Columbia, University, New York 1 Columbia Unversity, New York 1 Columbia University, New York, N.Y 150 Sao Paulo, Universidade, Brazil 55 Sao Paulo Univ., Brazil 51 Sao Paulo, Universidade, Sao Paulo, Brazil 43 Barcelona, Universidad, Spain 12 Santa Maria, Universidade Federal, Brazil 11 Granada, Universidad, Spain 8 Santander, Universidad, Spain 4 Zaragoza, Universidad, Spain 4 Stockholm, Universitet, Sweden 4 La Laguna, Universidad, Spain 3 Sao Paolo, Universidade, Brazil 3 Porto, Universidade, Portugal 2 Stockholm, University, Sweden 2 Sao Paulo, Univ., Brazil 2 Basel, Universitaet, Basel 1 Vigo, Universidad, Spain 1 Valladolid, Universidad, Spain 1 Tromso, Universitetet, Tromso 1 Sevilla, Universidad, Seville 1 Sao Paulo, Universidad, Brazil 1 Sao Paulo, Univ. do Estado, Brazil 1 Sao Paulo Universidade, Brazil 1 Sao Paolo Univ., Brazil 1 Santiago, Universidad, Chile 1 Santander, Universidad Spain 1 Santa Maria, Universidade Federal 1 Salamanca, Universidad, Spain 1 Evora, Universidade, Portugal 1 Cadiz, Universidad, Cadiz 79 Stanford University, Stanford, Calif. 47 Stanford University, Stanford, CA 38 Stanford Univ., Stanford, CA, US 11 Stanford University, Stanford, CA, US 8 Tufts University, Medford, Mass. 8 Stanford University, Stanford 3 Stanford Univ., Sandford, CA, US 2 San Jose State University, San Jose, Calif. 1 Stanford, University, Stanford, CA 1 Stanford University, Medical Center, Stanford, Calif. 1 Standord Univ., Stanford, CA, US 1 Nanjing University, Nanjing, China 62 New Mexico, University, Albuquerque 27 New Mexico, University, Albuquerque, NM 16 New Mexico, University, Albuquerque, N. Mex. 11 New Mexico Univ., Albuquerque 1 New Mexico University, Albuquerque, NM 1 Mew Mexico, University, Albuquerque 45 Kentucky, University, Lexington 35 Kentucky, University, Lexington, KY 34 Indiana University, Bloomington, IN 21 Nebraska, University, Lincoln, NE 19 Nebraska, University, Lincoln, Neb. 17 Kentucky, University, Lexington, Ky. 11 Kentucky Univ., Lexington 5 Vermont, University, Burlington, VT 4 Indiana, University, Bloomington, Ind. 2 Kentucky University, Lexington 1 Vermont, University, Burlington, Vt. 1 Texas, University, Arlington, Tex. 1 Kenucky, University, Lexington, KY 1 Kentucky, University, Louisville, KY 1 Kentucky, University, Lexington, 1 Indiana University, Bloomington, IL 42 Washington University, Saint Louis, MO 31 Washington University, St. Louis, MO 12 Washington University, St. Louis, Mo. 9 Washington Univ., Saint Louis, MO 5 Washington University, St. Louis, MO, US 5 Washington Univ., St. Louis, MO, US 5 Missouri, University, St. Louis, MO 4 Washington Univ., Saint Louis, MO, US 3 Missouri, University, St. Louis 2 Trinity University, San Antonio, TX 2 Missouri, University, St. Louis, Mo. 1 Washington, University, St. Louis, MO 1 Washington, University, Saint Louis, Mo 1 Washington, University, Saint Louis, MO 28 George Mason University, Fairfax, VA 24 Georgia State University, Atlanta, GA 17 George Mason University, Fairfax, Va. 13 George Mason Univ., Fairfax, VA, US 3 George Mason University, Fairfax, VA, US 2 George Mason Univ., Fairfax, VA 1 George Mason University, Fairfax, VA 22030, USA 1 Geoerge Mason University, Fairfax, VA, US 42 Glasgow, University, Scotland 38 Glasgow, University, Glasgow, Scotland 11 Moscow University, Moscow, Russia 5 Glasgow, University, Observatory, Glasgow, Scotland 3 Glasgow University Observatory, Glasgow, Scotland 2 Strathclyde, University, Glasgow, Scotland 2 Glasgow, University Observatory, Scotland 2 Glasgow Univ., Glasgow, UK 2 Aberdeen, University, Aberdeen, Scotland 1 Warsaw, University, Bialystock, Poland 1 Strathclyde University, Glasgow, Scotland 1 Krakow, Uniwersytet, Krakow, Poland 1 Glasgow University Observatory, Scotland 865 Space Telescope Science Institute, Baltimore, MD 186 Space Telescope Science Institute, Baltimore, MD, US 34 Space Telescope Science Institute 8 Space Telescope Science Institute, Baltimore, Maryland, US 6 Space Telescope Science Institute, Baltimore 3 Space Telescope Science Institute, Batimore, MD, US 2 Space Telescopic Science Institute, Baltimore, Maryland, US 2 Space Telescope Institute, Baltimore, MD 1 Space Telescope and Science Institute, Baltimore, MD, US 1 Space Telescope Space Institute, Baltimore, MD 1 Space Telescope Scientific Institute, Baltimore, MD, US 1 Space Telescope Science Institute, Baltimore. MD 1 Space Telescope Science Institute, Baltimore, MD 21218, USA 1 Space Telescope Science Institute, Balitmore, MD, US 26 Harvard-Smithsonian Center for Astrophysics 1 Harvard-Smithsonian Center for Astrophysics, US 28 National Center for Atmospheric Research, Boulder, CO, US 19 National Center for Atmospheric Research, Boulder, CO 10 National Center for Atmospheric Research, Boulder, Colo. 4 National Center for Atmospheric Research 2 National Center for Atmospheric, Boulder, CO, US 1 National Center for Atmospheric Research, Boulder, Colorado, US 93 Edinburgh, University, Scotland 71 Edinburgh, University, Edinburgh, Scotland 4 Edinburgh University, Scotland 2 Edinburgh University, Edinburgh, Scotland 57 Univ. of Tokyo, Tokyo, Japan 40 University of Tokyo, Tokyo, Japan 11 Univ. of Tokyo, Mitaka, Tokyo, Japan 11 Univ. of Tokyo, Bunkyo, Tokyo, Japan 10 Univ. of Tokyo, Tanashi, Tokyo, Japan 7 Universita di Roma, Rome, Italy 6 University of Turku, Piikkio, Finland 6 University of Tokyo, Nagano, Japan 6 University of London, London, UK 5 University of Moscow, Moscow, Russia 5 The Univ. of Tokyo, Tokyo, Japan 4 University of Bonn, Bonn, Germany 4 The University of Tokyo, Tokyo, Japan 3 University of Tokyo, Mitaka, Tokyo, Japan 3 Univ. of Tokyo, Meguro, Tokyo, Japan 2 University of Tokyo, Tokyo, Tokyo 2 University of Oslo, Oslo, Norway 2 University of Leeds, Leeds, UK 1 University of Wales, Wales, UK 1 University of Tsukuba, Ibaraki, Japan 1 University of Tromso, Tromso, Norway 1 University of Puerto Rico, Mayaguez 1 University of Puerto Rico, Cayey 1 University of Milano, Milano, Italy 1 University of Maine, Orono, ME, US 1 University of Kobe, Kobe, Japan 1 University of Iowa, IA, US 1 University of Crete, Crete, Greece 1 University of Bahrain, Bahrain 1 Universita de Roma, Rome, Italy 1 Univ. of Tokyo, Nagano, Japan 1 Univ. of Tokyo, Bunko, Tokyo, Japan 1 The University of Tokyo, Nagano, Japan 1 Shiba High School, Tokyo, Japan 274 Sussex, University, Brighton, England 135 Leicester, University, Leicester, England 29 Sussex, University, Brighton 6 Bristol, University, Bristol, England 4 York, University, Heslington, England 3 Sussex University, Brighton, England 2 Sussex, University, Falmer, England 2 Sussex University, Brighton 2 Oslo, University, Blindern, Norway 2 Essex, University, Colchester, England 1 Sussex, University, Sussex, England 1 Surrey, University, Guildford, England 1 Leicester, Universtity, Leicester, England 1 Leicester, University, Leicester England 159 Cornell University, Ithaca, N.Y. 133 Colorado, University, Boulder, Colo. 51 Indiana University, Bloomington, Ind. 15 Waikato, University, Hamilton, New Zealand 14 Rochester, University, Rochester, N.Y. 11 Fordham University, Bronx, N.Y. 9 Colgate University, Hamilton, NY 7 Houston, University, Houston, Tex. 7 Colgate University, Hamilton, N.Y. 4 Howard University, Washington, D.C. 4 Clemson University, Clemson, S.C. 3 Colorado University, Boulder, Colo. 3 Colgate Univ., Hamilton, NY, US 2 McMaster University, Hamilton 2 Colgate University, Hamilton 1 Syracuse University, Syracuse, N.Y. 1 Drew University, Madison, NJ 1 De Paul University, Chicago, Ill. 1 Cornell University, Arecibo, P.R. 1 Cornel University, Ithaca, N.Y. 1 Colgate University, Ithaca, N.Y. 1 Colgate Univ., Hamilton, NY 126 University College, Cardiff, Wales 11 University College, Campbell, Australia 4 University College, Canberra, Australia 1 University of Wales, Cardiff 1 University Colllege, Cardiff, Wales 1 University College, Galway 1 University College, Cardiff, Walles 1 University College of Wales, Cardiff 42 The Citadel, Charleston, SC 4 The Citadel, Charleston, SC, US 1 Citadel, Charleston, SC 1 Citadel, Charleston, S.C. 55 McMaster University, Hamilton, Canada 21 McMaster Univ., Hamilton, Canada 8 Queen's Univ., Kingston, Canada 4 Victoria Univ., Victoria, Canada 3 Queen's Univ., Ontario, Canada 2 Waikato Univ., Hamilton, New Zealand 2 Alberta Univ., Edmonton, Canada 1 Toronto Univ., Mississanga, Canada 1 Queens Univ., Ontario, Canada 1 McMaster Univ., Hamilton 1 Calgary Univ., Calgary, Canada 1 Calgary Univ, Calgary, Canada 1 Brandon Univ., Brandon, Canada 16 Valencia, Universidad, Burjassot, Spain 16 Valencia, Universidad, Burjasot, Spain 11 Barcelona, Universidad, Barcelona, Spain 8 La Laguna, Universidad, Tenerife, Spain 6 Zaragoza, Universidad, Saragossa, Spain 3 Pais Vasco, Universidad, Bilbao, Spain 3 La Laguna, Universidad, La Laguna, Spain 3 Extremadura, Universidad, Badajoz, Spain 2 Valencia, Universidad, Valencia, Spain 1 Valencia, Universidad Politecnica, Burjasot, Spain 1 Valencia, Universidad Literaria, Burjasot, Spain 1 Valencia Universidad Literaria, Burjasot, Spain 1 Sevilla, Universidad, Cadiz, Spain 86 Univ. of Colorado, Boulder, CO, US 64 University of Colorado, Boulder, CO, US 53 University of Texas, Austin, TX, US 21 University of Illinois, Urbana, IL, US 18 University of Delaware, Newark, DE, US 12 University of Oklahoma, Norman, OK, US 11 University of Oxford, Oxford, UK 9 University of Toledo, Toledo, OH, US 8 University of Georgia, Athens, GA, US 8 University of Colorado, Boulder, Colorado, US 5 University of Nebraska, Lincoln, NE, US 4 The University of Toledo, Toledo, OH, US 3 Univ. of Coloradio, Boulder, CO, US 3 Univ. of Colorada, Boulder, CO, US 2 University of Nevada, Las Vegas, NV, US 2 University of Iowa, Iowa City, IA, US 2 University of Deleware, Newark, DE, US 2 University of California, Irvine, CA, US 1 University of Texas, Ausrin, TX, US 1 University of Stanford, Stanford, CA, US 1 University of Oregon, Eugene, OR, US 1 University of Illinois, Urbans, IL, US 1 University of Alabama, Tucaloosa, AL, US 1 Univeristy of Colorado, Boulder, CO, US 53 Universidad de Chile, Santiago, Chile 6 Universidad Catolica de Chile, Santiago, Chile 5 P. Univ. Catolica de Chile, Santiago, Chile 2 Universidad de Chile, Santiago de Chile, Chile 2 Univ.de Chile, Casilla, Santiago, Chile 1 Universidad Tecnica, Valparaiso, Chile 1 Universidad Tecnica del Estado, Santiago, Chile 1 Univ. Catolica de Chile, Santiago, Chile 1 Univ. Catolica De Chile, Santiago, Chile 1 P. Universidad Catolica de Chile, Santiago, Chile 1 Ministero de Educacion, Santiago, Chile 1 Ministerio de Educacion, Santiago, Chile 23 Graz, Universitaet, Graz, Austria 10 Universitat Kiel, Kiel, Germany 9 Universitat Wien, Wien, Austria 7 Universitat Bonn, Bonn, Germany 5 Universita di Pisa, Pisa, Italy 3 University of Vienna, Vienna, Austria 3 Universitat zu Koln, Koln, Germany 2 University of Sydney, NSW, Australia 2 Universiteit Gent, Gent, Belgium 2 Universitat-GH Siegen, Siegen, Germany 2 Universitaet der Wien, Wien, Austria 2 Universitaet Bonn, Bonn, Germany 2 Universitaei Wien, Wien, Austria 2 Univ. Wien, Wien, Austria 2 Univ. Wien, Weien, Austria 1 Vienna, Universitaet, Wien, Austria 1 University of Sydney, Sydney, Australia 1 University of Sidney, Sidney, Australia 1 Universitatssternwarte, Vienna, Austria 1 Universitatsplatz, Graz, Austria 1 Universitats-Sternwarte, Vienna, Austria 1 Universitat Wein, Wein, Austria 1 Universitaetsternwarte, Vienna, Austria 1 Universitaetssternwarte, Vienna, Austria 1 Universitaetssternwarte, Graz, Austria 1 Universita Firenze, Firenze, Italy 1 Univ. Graz, Graz, Austria 19 University of Hong Kong, Hong Kong 8 Univ. of Hong Kong, Hong Kong 2 Univ. of Hong Kong, Hong Kong, China 2 City Polytechnic of Hong Kong, Hong Kong 96 Queen's University, Kingston, Ontario, Canada 46 Queen's University, Kingston, Canada 30 Waterloo, University, Waterloo, Ontario, Canada 20 York University, Downsview, Ontario, Canada 7 Windsor, University, Windsor, Ontario, Canada 4 Laurentian University, Sudbury, Ontario, Canada 3 Toronto, University, West Hill, Ontario, Canada 2 Queen's University, Kingston, Ontario 2 Queen's University at Kingston, Kingston, Ontario, Canada 2 Queen's Univ., Kingston, Ontario, Canada 1 York, University, Downsview, Ontario, Canada 1 Queens's University, Kingston, Ontario, Canada 1 Queens University, Kingston, Ontario, Canada 1 Queens University, Kingston, Canada 1 Kingston, Queen's University, Kingston, Ontario, Canada 54 Univ. of Michigan, Ann Arbor, MI, US 21 University of Michigan, Ann Arbor, MI, US 1 niv. of Michigan, Ann Arbor, MI, US 1 University of Michigan, Ann Arbor, MI, UK 282 Princeton University Observatory, NJ 169 Princeton University, NJ 68 Princeton Univ. Observatory, NJ 16 Princeton University, New Observatory, NJ 13 Copenhagen University Observatory, Denmark 5 Princeton University Observatory 5 Ankara University Observatory, Turkey 4 Princeton University, New Observatory 3 Princeton University, Observatory, NJ 3 Mount John University Observatory 2 Helsinki, University, Observatory 1 Wroclaw University, Observatory, Poland 1 Wroclaw University Observatory, Poland 1 Princeton Univ., Observatory, NJ 1 Istanbul University Observatory, Turkey 1 Copenhagen University Observatory 1 Cincinnati Observatory, OH 1 Ankara, University Observatory 1 Ankara University, Observatory, Turkey 22 National Radio Astronomy Observatory 6 Radio Astronomy Observatory 3 National Astronomical Observatory 2 Glenlea Astronomical Observatory 1 Uppsala Astronomical Observatory 1 Torun Radio Astronomy Observatory, Poland 1 Natsionalna Astronomicheska Observatoriia 1 National Radioastronomy Observatory 1 National Radio Astronomy, Tucson, AZ, US 1 Korea Astronomy Observatory 545 Royal Observatory, Edinburgh, Scotland 39 Royal Observatory, Edinburgh, United Kingdom 8 Royal Observatory, Edinburgh, UK 6 Royal Observatory, Scotland 6 Royal Observatory, Edinburgh, Scotland, UK 3 Royal Observatory Edinburgh, Edinburgh, UK 3 Edinburgh, Royal Observatory, Edinburgh, Scotland 1 Royal Observatory, London, England 1 Royal Observatory, Edingburgh, Scotland 1 Royal Observatory, Edinburgh, England 1 Royal Observatory, Edinburg, England 1 Royal Observatory Edinburgh, Scotland 1 Napier College, Edinburgh, Scotland 48 Onsala Space Observatory, Sweden 46 Onsala Space Observatory, Onsala, Sweden 43 Lund Observatory, Sweden 13 Palomar Observatory, Pasadena 11 Onsala Space Observatory, Goteborg, Sweden 6 Ankara Univ. Observatory, Turkey 3 Uppsala Astronomical Observatory, Sweden 2 Uppsala Observatory, Sweden 2 Onsala Space Observatory, S-43900 Onsala, Sweden 2 Onsala Space Observatory, Onsala 1 Stockholm Observatory, Sweden 1 Calar Alto Observatory, Spain 11 Yunnan Observatory, Kunming, China 8 Yunnan Observatory, Yunnan, China 8 Yunnan Observatory, Kumming, China 6 Purple Mountain Observatory, Nanjing, China 5 Yunnan Observatory, Kunming 4 Yunnan Observatory, Kunming, Yunnan, China 3 Auroral Observatory, Tromso, Norway 2 Yunnan University, Kunming, China 2 Shanghai Observatory, Shanghai, China 2 Shanghai Observatory, China 2 Beijing Observatory, Beijing, China 1 Yunnan Normal Univ., Kunming, China 1 Shaanxi Observatory, Lintong, China 1 Renner Observatory, Dousman, Wis. 1 Kwasan Observatory, Kyoto, Japan 1 Baja Observatory, Hungary 26 Konkoly Observatory, Budapest, Hungary 11 Konkoly Obszervatorium, Budapest, Hungary 1 Konkoly Observatorium, Budapest, Hungary 19 Cloudcroft Observatory, Cloudcroft, NM 2 Cloudcroft Observatory, Cloudcroft, N. Mex. 1 Cloudcraft Observatory, Cloudcroft, NM 1 Astronomy Observatory, Socorro, NM 94 Utrecht, Rijksuniversiteit, Utrecht, Netherlands 50 Utrecht, Rijksuniversiteit, Netherlands 4 Utrecht University, Utrecht, Netherlands 3 Utrecht, Sterrewacht, Utrecht, Netherlands 3 Utrecht, Sterrekundig Instituut, Utrecht, Netherlands 2 Utrecht, Rijksuniversiteit, Utrecht 1 Utrecht, Universiteit, Utrecht, Netherlands 1 Utrecht, Rijksuniversitet, Utrecht, Netherlands 1 Utrecht, Rijksuniversitet, Netherlands 1 Utrecht, Rijksuniversiteit,Netherlands 1 Utrecht, Rijksuniversiteit, Sterrewacht, Netherlands 1 Utrecht Rijksuniversiteit, Utrecht, Netherlands 1 Utrecht Rijksuniversiteit, Netherlands 9 Chalmers Tekniska Hogskola, Goteborg, Sweden 8 Kungl. Tekniska Hogskolan, Stockholm, Sweden 4 Kungliga Tekniska Hogskolan, Stockholm, Sweden 3 Chalmers Univ. of Tech., Goeteborg, Sweden 2 Chalmers Univ. of Technology, Goteborg, Sweden 1 Chalmers Tekniska Hogskola, Goteborg 25 Paris XI, Universite, Orsay, Essonne, France 3 Paris XI, Universite, Orsay, Essonne 1 Paris XI, Universite, Sceaux, Hauts-de-Seine, France 1 Paris XI, Orsay, Essonne, France 30 New Mexico State Univ., Las Cruces, NM, US 8 New Mexico State Univ., Las Cruces 6 New Mexico St. Univ., Las Cruces, NM, US 1 New Mexico Sate Univ., Las Cruces, NM, US 166 Leicester, University, England 155 Manchester, Victoria University, England 145 Manchester, Victoria University, Manchester, England 14 Manchester, Victoria Univ., United Kingdom 3 Manchester, Victoria University, United Kingdom 2 Wellington, Victoria University, New Zealand 2 Manchester, Victoria University, Manchester 1 Manchester, Victoria University, Machester, England 1 Manchester, Victoria Univ. 1 Manchester, University, England 1 Lancaster, University, England 28 Montpellier II, Universite, France 14 Montpellier II, Universite, Montpellier, France 11 South Florida, University, Tampa 11 Montpellier II, Univ., France 6 Montpellier II, Universite 4 Lille I, Universite, France 3 Grenoble I, Universite, France 3 Bruxelles, Universite Libre 2 Orleans, Universite, France 1 Univ. Montpellier II, Montpellier, France 1 Tours, Universite, France 1 Rennes I, Universite, France 1 Northern Iran, University, Iran 1 Montpellier II, Universite, Montpellier 1 Montpelier II, Universite, Montpelier, France 1 Montpelier II, Universite, France 1 Grenoble I, Universite, Grenoble 1 Chambery, Universite, France 1 Besancon, Universite, France 56 Jerusalem, Hebrew University, Israel 7 Jerusalem, Hebrew University 6 Jerusalem Hebrew Univ., Israel 85 Toronto, University, Toronto, Canada 60 York University, Toronto, Canada 43 York University, North York, Canada 22 York University, Downsview, Canada 15 York Univ., North York, Canada 10 Trent University, Peterborough, Canada 9 York Univ., North York, Ontario, Canada 3 York University, North York, Ontario, Canada 2 Toronto University, Toronto, Canada 1 York University, Ontario, Canada 1 York University, North York 1 York University, Concord, Canada 1 York University, Canada 1 Toronto, University, Scarborough, Canada 230 Tokyo, University, Japan 196 Texas, University 115 SISSA, Trieste, Italy 85 Texas Univ., Austin 65 Boston University, MA 60 Montreal, Universite 50 Rochester, University 49 Toledo, University, OH 48 Universite Laval 46 Lick Observatory 42 CNRS, Paris, France 35 Barcelona, Universidad 34 Pisa, Universita, Italy 32 Rochester, University, NY 32 Bologna, Universita 24 Catania, Universita 24 Arizona, University 22 Milano, Universita 22 Bonn Univ., Germany 21 Padova, Universita 19 Torun, Uniwersytet, Poland 19 Padova, Universita, Padua 18 Wise Observatory 18 Trieste, Universita 17 Lecce, Universita, Italy 15 Liege Univ., Belgium 14 Nevada Univ., Las Vegas 13 Roma I, Universita 12 Nice, Universite, France 12 Delhi, University, India 11 Roma, Universita, Rome 11 Palermo, Universita 10 Toyama University, Japan 9 Kiel Univ., Germany 9 Bonn, Universitaet 9 Athens Univ., Greece 7 Wyoming Univ., Laramie 7 Wroclaw, Uniwersytet, Poland 7 Torino, Universita 7 Pisa Univ., Italy 7 IUE Observatory 7 Columbia University 6 Torun Univ., Poland 6 Tokyo, University 6 Oslo Univ., Norway 6 Lodz Univ., Poland 6 CSIC, Blanes, Spain 5 Regina, University, Canada 5 Raman Research Institute 5 Oslo, University, Norway 5 NCAR, Boulder, CO 5 Lodz, University, Poland 5 Iowa Univ., Iowa City 5 Delhi Univ., India 5 Columbia University, NY 5 CNRS, Nice, France 5 CNRS, Lyon, France 5 Bologna, Univ., Italy 5 Bochum, Ruhr-Universitaet 4 Pisa, Universita 4 Oulu Univ., Finland 4 Nice, Universite 4 Lodz, Uniwersytet, Poland 4 Liege, Univ., Belgium 4 Lecce Univ., Italy 4 IKI, Moscow, Russia 3 York University 3 Utsunomiya University, Japan 3 USAF, Phillips Lab. 3 The University, UK 3 SISSA, Trieste 3 Roma, Universita 3 Pavia, Universita 3 Nice Univ., France 3 Lund, University, Sweden 3 Lund Univ., Sweden 3 Liege, Universite, Liege 3 Leiden, Rijksuniversiteit 3 Lecce, Universita 3 La Plata, Univ. Nacional 2 Yamagata Univ., Japan 2 Vigo Univ., Spain 2 Victoria, University 2 Utsunomiya Univ., Japan 2 UniversiteLaval 2 Turin Univ., Italy 2 Titan Systems, Inc. 2 Texas University 2 Royal Observatory 2 Roma II, Universita 2 Roma II, Univ., Rome 2 Roma I, Universita, Italy 2 Rochester University 2 Regina Univ., Canada 2 Pune, University, India 2 Perugia, Universita 2 Napoli, Universita 2 Nagoya, University, Japan 2 NIKHEF, Netherlands 2 NCRA, Pune, India 2 Mons, Universite, Belgium 2 Milan Univ., Italy 2 Mees Observatory 2 MPIfR, Bonn, Germany 2 Ilinois Univ., Urbana 2 IUCAA, Pune, India 2 IKI, Moscou, Russia 2 Graz Univ., Austria 2 Gorakhpur, University, India 2 CNR, Rome, Italy 2 Bochum, Sternwarte 2 Beijing Univ., China 1 York Univ., Toronto 1 York Univ., Canada 1 Wyoming, University 1 Umea Universitet, Sweden 1 Tuebingen, Universitaet 1 Tuebingen, Universitae 1 Tsukuba, University, Japan 1 Tromso, Universitetet 1 Toyama Univ., Japan 1 Toledo, University, Ohio 1 Tokyo, University Japan 1 Tokyo Univ., Mitaka 1 Tohoku Univ., Sendai 1 Texas, Univerity 1 Sofia Univ., Bulgaria 1 Sissa, Trieste, Italy 1 Shiraz University, Iran 1 Sevilla, Univ., Spain 1 Roma II, Universita, Italy 1 Roma I, Universita, Rome 1 RIKEN, Wako, Japan 1 RIKEN, Saitama, Japan 1 RHUS C, DENMARK 1 Pune, University 1 Potsdam Univ., Germany 1 Poona University, India 1 Pisa, Universita, Pisa 1 Oslo, Universitet, Norway 1 Nice, Universite, Nice 1 Nice, Univ., France 1 Muenchen, Universitaet 1 Montrel, Universite 1 Milan, Universita 1 Messina, Universita 1 Lyon I, Universite 1 Lowell Observatory 1 Lille I, Universite 1 Liege, Universite de l'Etat 1 Liege, Universite 1 Leiden, Sterrewacht 1 Leeds, University 1 Leeds University, Leeds 1 Lecce, Universita, Lecce 1 Kiel, Neue Universitaet 1 Jena Univ., Germany 1 Ist. Universitario Navale 1 Inst. of Physics 1 ISO Observatory 1 INFN, Perugia, Italy 1 Grenoble I, Universite 1 Granada, Universidad 1 Giessen, Universitaet 1 Genova, Universita 1 Genoa Univ., Italy 1 Geneve, Universite, Geneva 1 Gdansk Univ., Poland 1 Firenze, Universita 1 FNRS, Liege, Belgium 1 ERDA, Ames, Iowa 1 DARA, Bonn, Germany 1 CNR-GNA, Trieste, Italy 1 CHEAF, Amsterdam 1 CERN, Switzerland 1 Boston, University, MA 1 Bonn, Univ., Sternwarte 1 Bonn, Univ., Germany 1 Blida Univ., Algeria 1 Beckman Institute 1 Bari, Universita, Italy 1 Arizona, University. Tucson 1 Alabama, University 1 Abril Univ., Iraq 167 Arizona, University, Tucson, Ariz. 55 Oklahoma, University, Norman 31 Oklahoma, University, Norman, Okla. 21 Oklahoma, University, Norman, OK 17 Villanova University, Villanova, PA 12 Villanova University, Villanova, Pa. 10 Oklahoma Univ., Norman 5 Alabama, University, Birmingham 2 Oklahoma University, Norman, Okla. 1 Vilanova University, Villanova, PA 1 Old Dominion University, Norfolk, Va. 1 Oklahoma, University, Norman, Ok 1 Loyola University, Chicago, Ill. 1 Arizona University, Tucson, Ariz. 1 Alabama, University, Birmingham, Ala. 114 Florida, University, Gainesville 69 Florida, University, Gainesville, Fla. 61 Florida, University, Gainesville, FL 22 Alabama, University, University, Ala. 16 Florida Univ., Gainesville 12 South Florida, University, Tampa, Fla. 12 Alabama, University, Huntsville, Ala. 12 Alabama, University, Huntsville, AL 7 Denison University, Granville, OH 5 Florida Univ., Gainesville, FL, US 2 Denison University, Granville, Ohio 1 Florida, University, Gainsville 1 Florida, University, Gainesville, Fla 1 Florida University, Gainesville 205 Michigan, University, Ann Arbor 72 Michigan, University, Ann Arbor, MI 47 Wisconsin, University, Madison, WI 38 Michigan Univ., Ann Arbor 6 Michigan Univ., Ann Arbor, MI, US 5 Michigan, University, Dearborn 3 Wisconsin, University, Eau Claire, WI 1 Wisconsin, Univerity, Madison, WI 1 Texas, University, San Antonio, TX 52 Saint Mary's University, Halifax, Canada 6 Dalhousie University, Halifax, Canada 4 Saint Mary's Univ., Halifax, Canada 3 St. Mary's University, Halifax, Canada 3 Saint Mary's University, Halifax 2 Simon Frazer University, Burnaby, Canada 2 Saint Mary's Univ., Halifax 18 Utah, University, Salt Lake City, Utah 10 Utah, University, Salt Lake City, UT 8 Utah, University, Salt Lake City 1 Utah Univ., Salt Lake City 47 Athens, University, Greece 44 Cornell University, Ithaca, NY, US 32 Oregon, University, Eugene, Ore. 30 Salonika, University, Salonika, Greece 30 Athens, University, Athens, Greece 16 Crete, University, Heraklion, Greece 10 National Observatory, Athens, Greece 8 Patras, University, Patras, Greece 6 Ankara, University, Ankara, Turkey 4 Widener University, Chester, PA 4 Orleans, Universite, Orleans, France 3 Univ. of Athens, Athens, Greece 3 Ioannina, University, Ioannina, Greece 2 Crete, University, Iraklion, Greece 2 Athens, National University, Athens, Greece 2 Athens Univ., Athens, Greece 1 Thrace, University, Xanthi, Greece 1 Thrace, University, Xanthe, Greece 1 Georgia, University, Athens, Ga. 1 Georgia, University, Athens, GA 1 Athens, Academy, Athens, Greece 1 Athens University, Zografos, Greece 1 Ankara University, Ankara, Turkey 1 Aegean University, Izmir, Turkey 370 Cornell University, Ithaca, NY 43 Rutgers University, Piscataway, NJ 39 Tufts University, Medford, MA 24 Brandeis University, Waltham, MA 13 Boston University, Boston, MA 12 Lehigh University, Bethlehem, PA 12 Brandeis University, Waltham, Mass. 12 Arkansas, University, Little Rock 11 Brandon University, Canada 10 Brandeis Univ., Waltham, MA, US 3 Boston, University, Boston, MA 3 Arya Mehr University, Teheran, Iran 2 Clarkson University, Potsdam, NY 2 Brandeis Univ., Waltham, MA 1 Trondheim, University, Norway 1 Brandeis Universiy, Waltham, MA 1 Brandeis University, Waltham, MD 1 Andhra University, Waltair, India 116 Tokyo, University, Tokyo, Japan 77 Indiana University, Bloomington 73 Nagoya University, Nagoya, Japan 51 Tohoku University, Sendai, Japan 27 Sophia University, Tokyo, Japan 19 Niigata University, Japan 9 Ibaraki University, Mito, Japan 6 Rikkyo University, Tokyo, Japan 6 Niigata University, Niigata, Japan 5 Yamagata University, Japan 5 Tsurumi University, Yokohama, Japan 5 Kokugakuin University, Tokyo, Japan 4 Nagoya University, Furocho, Japan 4 Miyazaki University, Japan 4 Hirosaki University, Japan 4 Gifu University, Gifu, Japan 3 Pahlavi University, Shiraz, Iran 3 Osaka Kyoiku University, Japan 3 Osaka City University, Japan 3 Miyazaki University, Miyazaki, Japan 3 Kanagawa University, Yokohama, Japan 3 Ibaraki University, Mito 3 Haifa, University, Tivon, Israel 3 Doshisha University, Kyoto, Japan 2 Utsunomiya University, Mine, Japan 2 Tohoku University, Aoba, Japan 2 Tohoku Gakuin University, Sendai, Japan 2 Shiraz, University, Shiraz, Iran 2 Osaka Kyoiku University, Osaka, Japan 2 Kharkov University, Kharkov, Ukraine 2 Iwate University, Morioka, Japan 1 Tohuku University, Sendai, Japan 1 Tohoku-Gakuin University, Tagajo, Japan 1 Osaka, Kyoiku University, Japan 1 Okayama University, Okayama, Japan 1 Nebraska University, Lincoln 1 Meisei University, Hino, Japan 1 Meerut University, Meerut, India 1 Kyushu University, Fukuoda, Japan 1 Kobe Women's University, Kobe, Japan 1 Keio University, Tokyo, Japan 1 Ibaraki, University, Mito, Japan 1 Ibaraki University, Mita, Japan 1 Ibaraki Univ., Bunkyo, Mito, Japan 1 Hosei University, Tokyo, Japan 1 Hitotsubashi University, Tokyo, Japan 1 Cairo, University, Cairo, Egypt 1 Aoyama-Gakuin University, Tokyo, Japan 35 Negev, University, Beersheba, Israel 6 Negev Univ., Beersheba, Israel 5 Lehigh University, Bethlehem, Pa. 3 Aegean University, Bornova, Turkey 2 Haifa, University, Haifa, Israel 1 Teheran University, Teheran, Iran 1 Haifa, University, Oranim, Israel 1 Ege University, Bornovo, Turkey 38 Paris XI, Universite, Orsay, France 34 Paris VII, Universite, France 24 Nice, Universite, Nice, France 21 Paris VII, Universite, Paris, France 21 Paris VI, Universite, Paris, France 19 Paris VII, Universite, Paris 14 Paris VI, Universite, France 13 Paris XI, Univ., Orsay, France 13 Paris VII, Univ., France 12 Picardie, Universite, Amiens, France 5 Paris VII, Universite, Meudon, France 4 Paris XI, Universite, France 3 Toulouse, Universite, Toulouse, France 3 Nancy I, Universite, Nancy, France 2 Paris X, Universite, Ville-d'Avray, France 2 Paris VII, Univ., Meudon, France 2 Paris VI, Univ., France 2 Lyon I, Universite, Lyons, France 2 Lille I, Universite, Lille, France 1 Toulon, Universite, La Garde, France 1 Paris XI, Universite, Paris, France 1 Paris XI, Universite, Orsay 1 Paris VII, Universite, Fance 1 Paris VI, Univ., Orsay, France 1 Paris IX, Universite, Paris, France 1 Marseille I, Universite, Marseille, France 1 Dijon, Universite, Dijon, France 1 Bordeaux I, Universite, Talence, France 1 Besancon, Universite, Besancon, France 16 New Hampshire, University, Durham, N.H. 46 Univ. of Washington, Seattle, WA, US 23 University of Washington, Seattle, WA, US 6 University of Wyoming, Laramie, WY, US 1 University of Washington, Seattle, Washington, US 1 Univ. ofWashington, Seattle, WA, US 1 Univ. of Washington, Settle, WA, US 75 ESA, Space Science Dept., Noordwijk, Netherlands 38 ESA, Astronomy Div., Noordwijk, Netherlands 34 ESA, Astrophysics Div., Noordwijk, Netherlands 3 ESTEC, Astrophysics Div., Noordwijk, Netherlands 3 ESA, Space Science Div., Noordwijk, Netherlands 1 ESA, Astronomy Section, Noordwijk, Netherlands 1 ESA, Astronomy Div. Noordwijk, Netherlands 1 ESA Space Sciences Div., Noordwijk, Netherlands 24 Univ. of Amsterdam, Amsterdam, Netherlands 14 University of Amsterdam, Amsterdam, Netherlands 7 Vrije Universiteit, Amsterdam, Netherlands 7 Univ. of Amsterdam, Amsterdam, The Netherlands 7 Free University, Amsterdam, Netherlands 4 Univ. of Utrecht, Utrecht, Netherlands 2 University of Amsterdam, Amsterdam, The Netherlands 1 Fokker Aerospace, Amsterdam, Netherlands 1 Comprimo, Amsterdam, Netherlands 88 NASA, Goddard Institute for Space Studies, New York, N.Y. 56 NASA, Goddard Institute for Space Studies, New York 27 NASA, Goddard Institute for Space Studies, New York, NY 9 NASA, Goddard Inst. for Space Studies, New York 6 NASA. Goddard Inst. for Space Studies, New York, NY, US 3 NASA. Goddard Institute for Space Studies, New York, NY, US 1 Nasa, Goddard Institute for Space Studies, New York 1 NASA, Goddard Institut for Space Studies, New York, N.Y. 1 Goddard Institute for Space Studies, New York 64 Nordisk Institut for Teoretisk Atomfysik, Copenhagen, Denmark 1 Nordisk Institute for Teoretisk Atomfysik, Copenhagen, Denmark 1 Nordisk Institut for Teoritisk Atomfysik, Copenhagen, Denmark 1 Nordisk Institut for Teoretisk Atomphysik, Copenhagen, Denmark 1 Nordisk Institut for Teoretisk Atmofysik, Copenhagen, Denmark 86 Observatoire Royal de Belgique, Brussels, Belgium 2 Observatoire Royal de Belgique, Uccle, Belgium 1 Observatoire, Royal de Belgique, Brussels, Belgium 1 Observatoire Royale de Belgique, Brussels, Belgium 1 Observatoire Royal, Brussels, Belgium 1 Observatoire Royal de Belgique, Bruxelles, Belgium 1 Observatoire Royal de Belgique, Brussels 1 Observatoire Royal de Belgique, Brussells, Belgium 269 Tata Institute of Fundamental Research, Bombay, India 56 Tata Institute of Fundamental Research, Bangalore, India 43 Tata Institute of Fundamental Research, Ootacamund, India 40 Tata Inst. of Fundamental Research, Bombay, India 15 Tata Institute of Fundamental Research, Poona, India 9 Tata Institute for Fundamental Research, Bombay, India 5 Tata Inst. of Fundamental Research, Poona, India 4 Tata Inst. of Fundamental Research, Colaba, Bombay, India 3 Tata Institute of Fundamental Research, Bombay 2 Tati Institute of Fundamental Research, Bombay, India 2 Tata Institute of Fundamental Research, Pune, India 2 Tata Institute of Funadamental Research, Bombay, India 1 Tata Institute of Fundamental Research, Ootmund, India 1 Tata Institute of Fundamental Research, Ootacamund 1 Tata Institute of Fundamental Research, Ootacamud, India 1 Tata Institute of Fundamental Research, Oatacamund, India 1 Tata Institute of Fundamental Research, Bombay 400 005, India 1 Tata Institute of Fundamental Research, Bombary, India 1 Tata Institute for Fundamental Studies, Bombay, India 1 Tata Institute for Fundamental Research, Bangalore, India 1 Tata Inst. of Fundamental Research, Pune, India 1 Tata Inst. of Fundamental Research, Pouna, India 1 Tata Inst. of Fundamental Research, Bombay 44 Landessternwarte Koenigstuhl, Heidelberg, Germany 14 Landessternwarte Koenigstuhl, Heidelberg, West Germany 13 Landessternwarte, Heidelberg, Germany 8 Landessternwarte, Koenigstuhl, West Germany 4 Landessternwarte Konigstuhl (LSW), D-69117 Heidelberg, Germany 3 Landessternwarte Koenigstuhl, Heidelberg 2 Landessternwarte, Koenigstuhl, Heidelberg, West Germany 2 Landessternwarte Konigstuhl, D-69117 Heidelberg, Germany 2 Landessternwarte Heidelberg, Heidelberg, Germany 1 Landessternwarte, Konigstuhl, Heidelberg, Germany 1 Landessternwarte, Koenigstuhl, Heidelberg, Germany 1 Landessternwarte, Heidelburg, Germany 1 Landessternwarte Konigstuhl, 69117 Heidelberg, Germany 1 Landessternwarte Heidelberg-Konistuhl, Heidelberg, Germany 1 Landessternwarte Heidelberg-Koenigstuhl, Heidelberg, Germany 1 Landessternwarte Heidelberg, Germany 37 Max-Planck-Institut fuer Astrophysik, Garching, Germany 25 Max-Planck-Institut fuer Astronomie, Heidelberg, Germany 17 Max-Planck-Institut fuer Kernphysik, Heidelberg, Germany 13 Max-Planck-Inst. fuer Kernphysik, Heidelberg, Germany 13 Max-Planck-Inst. fuer Astrophysik, Garching, Germany 8 Max-Planck Institut fuer Astrophysik, Garching, Germany 3 Max-Planck-Institut fuer Physik, Muenchen, Germany 3 Max-Planck-Institut fuer Astrophysick, Garching, Germany 2 Max-Planck-Institute fuer Astrophysik, Garching, Germany 2 Max-Planck-Institute for Astrophysics, Garching, Germany 2 Max-Planck-Institut fur Astrophysik, D-85740 Garching, Germany 2 Max-Planck-Institut fur Astrophysik, 85740 Garching, Germany 2 Max-Planck-Institut fuer Astrophysik, Muenchen, Germany 2 Max-Planck-Institut fuer Astrophysik, Germany 2 Max-Planck-Institut fuer Astrophysik, Gar 2 Max-Planck-Institut fuer Astronomie, Heidelburg, Germany 2 Max-Planck-Inst. fuer Astrophysik, Muenchen, Germany 2 Max-Planck-Insitut fuer Astrophysik, Garching, Germany 2 Max-Planck Institut fur Astrophysik, D-85740 Garching, Germany 2 Max Planck Institut fuer Astrophysik, Garching, Germany 2 MPI fuer Astrophysik, Garching, Germany 1 Max-Planck-Institute fur Astrophysik, 85740 Garching, Germany 1 Max-Planck-Institute fuer Astronomie, Heidelburg, Germany 1 Max-Planck-Institut fur Astrophysik, D-85740, Garching, Germany 1 Max-Planck-Institut fur Astronomie, Heidelberg, Germany 1 Max-Planck-Institut fuer Astrophysik, Garching 1 Max-Planck-Institut fuer Astrophsik, Garching, Germany 1 Max-Planck-Inst. fuer Astrophysik, Germany 1 Max-Planck-Inst. fuer Astrophysik, Garching bei Munich, Germany 1 Max-Planck-Inst fuer Astrophysik, Muenchen, Germany 1 Max-Planck-Inst fuer Astrophysik, Garching, Germany 1 Max-Planck-Insititut fuer Astrophysik, Garching, Germany 1 Max-Planck Inst. fuer Astrophysik, Garching, Germany 1 Max Planck Institut fuer Kernphysik, Heidelberg, Germany 221 Montreal, Universite, Montreal, Canada 44 Alberta, University, Edmonton, Canada 24 Montreal, Universite, Montreal 10 Montreal, Universite, Canada 6 Montreal Univ., Montreal, Canada 6 Manitoba, University, Winnipeg, Canada 2 Victoria, University, Victoria, Canada 2 Ottawa, University, Ottawa, Canada 2 Montreal, University, Montreal, Canada 2 McGill University, Montreal, Canada 1 Waterloo, University, Waterloo, Canada 1 Montreal, Universite Montreal 1 Montreal, Universiite, Montreal 1 Montreal Universite, Montreal, Canada 1 Montreal Universite, Montreal 1 Montana, University, Missoula, Mont. 1 Mont-Megantic, Observatoire, Montreal, Canada 1 McGill Univ., Montreal, Canada 20 Eotvos Lorand Tudomanyegyetem, Budapest, Hungary 3 Eotvos Lorand University, Budapest, Hungary 1 Eotvos Lorand Univ., Budapest, Hungary 57 Andalucia, Instituto de Astrofisica, Granada, Spain 3 Instituto de Astrofisica, Granada, Spain 2 Canarias, Instituto de Astrofisica, La Laguna, Spain 1 Andalucia, Instituto de Astrofisica, Granada 1 Andalucia, Instituto de Astrofisica, Apartado, Spain 1 Andalucia, Instituto de Astrofisica 132 CNR, Istituto di Fisica Cosmica, Milan, Italy 12 CNR, Ist. di Fisica Cosmica, Milan, Italy 9 CNR, Istituto di Cosmogeofisica, Turin, Italy 6 Instituto di Fisica Cosmica del CNR, Milano, Italy 5 CNR, Istituto di Fisica Cosmica, Milan 5 CNR, Istituto di Cosmo-Geofisica, Turin, Italy 5 CNR, Ist. di Fisica Cosmica, Milan 4 CNR, Laboratorio di Fisica Cosmica, Milan, Italy 4 CNR, Istituto di Fisica dell'Atmosfera, Rome, Italy 3 Istituto di Fisica Cosmica del CNR, Milano, Italy 1 Istituto di Fisica del CNR, Milano, Italy 1 Istituto di Fisica Cosmica, CNR, Milano, Italy 1 Instituto di Fisica Cosmica, Milano, Italy 1 Institut di Fisica Cosmica del CNR, Milano, Italy 1 CNR, Laboratorio Fisica Cosmica, Milan, Italy 1 CNR, Istituto di Fisica Cosmica, Italy 1 CNR, Istituto di Cosmo-geofisica, Turin, Italy 53 Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK 22 Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE 87 Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass. 1 Smithsonian Astrophysical Observatory, and Harvard College Observatory, Cambridge, Mass. 30 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK 10 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA 1 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0EZ 72 Harvard College Observatory and Smithsonian Astrophysical Observatory, Center for Astrophysics, Cambridge, Mass. 186 Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, Mass. 2 Harvard College Observatory and Smithsonian Astrophysical Laboratory, Cambridge, Mass. 1 Havard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, Mass. 1 Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, MA 119 Heidelberg, Universitaet, Heidelberg, West Germany 5 Heidelberg, Universitaet, Heidelberg 2 Heidelberg, Universitat, Heidelberg, West Germany 2 Heidelberg Univ., Heidelberg, Germany 16 Astronomisches Rechen-Institut, Heidelberg, West Germany 11 Astronomisches Rechen-Inst., Heidelberg, Germany 4 Astronomisches Rechen-Institut, Heidelberg, Germany 3 Astronomisches Recheninstitut, Heidelberg, West Germany 2 Astronomiches Rechen-Institut, Heidelberg, Germany 27 Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Haute-Provence, France 4 Haute Provence, Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Haute-Provence, France 3 Haute-Provence, Observatoire, Saint-Michel l'Observatoire, Alpes-de-Haute-Provence, France 3 Haute-Provence Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Haute-Provence, France 1 Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Hautes-Provence, France 1 Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Haute-Provence 1 Haute-Provence, Observatoire, Saint-Michel-L'Observatoire, Alpes-de-Haute-Provence, France 1 Haute-Provence, Observatoire, Saint-Michel l'Observatoire, Alpes-de-Haut-Provence, France 1 Haute-Provence, Observatoire, Saint Michel-l'Observatoire, Alpes-de-Haute-Provence, France 1 Haute-Provence, Observatoire Saint-Michel-l'Observatoire, Alpes-de-Haute-Provence, France 1 Haute-Provence Observatoire, Saint-Michel l'Observatoire, Alpes-de-Haute-Provence, France 1 Haute Province, Observatoire, Saint-Michel-l'Observatoire, Alpes-de-Haute-Province, France 1 Haute Provence, Observatoire, Saint-Michel-L'Observatoire, Alpes-de-Haute-Provence 28 Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK 18 Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH 8 Department of Physics and Astronomy, Leicester University, University Road, Leicester LE1 7RH, UK 3 Department of Physics & Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK 16 Physics Department, University of Durham, South Road, Durham DH1 3LE, UK 11 Physics Department, University of Durham, South Road, Durham DH1 3LE 6 Physics Department, University of Durham, Durham DH1 3LE, UK 45 Nuffield Radio Astronomy Laboratories, Jodrell Bank, England 4 Nuffield Radio Astronomy Observatory, Jodrell Bank, England 4 Nuffield Radio Astronomy Observatory, Jodrell Bank, Ches., England 3 Nuffield Radio Astronomy Observatories, Jodrell Bank, England 3 Nuffield Radio Astronomy Laboratories, Jodrell Bank, Chesire, UK 2 Nuffield Radio Astronomy Laboratories, Macclesfield, England 1 Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, England 36 Bell Telephone Laboratories, Inc., Murray Hill, N.J. 20 Bell Telephone Laboratories, Inc., Murray Hill, NJ 3 Bell Telephone Laboratories, Inc., Murray Hill 2 Bell Telephone Laboratories, Murray Hill, NJ 1 Bell Telephone Laboratories, Inc., Crawford Hill, N.J. 1 AT&T Bell Telephone Laboratories, Inc., Murray Hill