With random k-means (no seed):
4 motion clusters:
==================
Exact:				Approximate:			Coarse:				List:
125.189 - 10 clusters		49.6452 -  5 clusters		14.2696 - 5 clusters		16.6853 - 5 clusters
129.206 - 11 clusters		52.1741 - 13 clusters		15.2588 - 5 clusters		17.7365 - 5 clusters
128.375 - 10 clusters		41.5019 - 10 clusters		15.5520 - 6 clusters		17.5751 - 6 clusters
197.848 - 10 clusters		43.9090 -  6 clusters		15.1447 - 6 clusters		17.3059 - 6 clusters
102.633 -  7 clusters		62.2284 -  8 clusters		21.5482 - 5 clusters		19.6271 - 6 clusters
104.225 -  7 clusters		56.0053 -  8 clusters		19.8915 - 6 clusters		18.2760 - 7 clusters
107.957 -  9 clusters		54.4663 -  8 clusters		20.4761 - 5 clusters		18.4046 - 5 clusters
124.341 -  9 clusters		58.6006 - 11 clusters		19.9366 - 7 clusters		18.0122 - 7 clusters
82.1877 - 10 clusters		56.5180 -  5 clusters		30.8158 - 4 clusters		25.3787 - 5 clusters
127.798 - 11 clusters		51.5256 -  8 clusters		16.2436 - 5 clusters		15.8134 - 5 clusters
	Mean: 122.976			Mean: 52.655			Mean: 18.914			Mean: 18.481


3 motion clusters:
==================
Exact:				Approximate:			Coarse:				List:
238.035 - 8 clusters		54.3648 - 5 clusters		28.4918 - 4 clusters		21.8009 - 4 clusters
203.230 - 6 clusters		159.879 - 4 clusters		32.0062 - 3 clusters		24.1724 - 3 clusters
213.935 - 7 clusters		93.0095 - 5 clusters		32.0789 - 4 clusters		25.3164 - 4 clusters
196.579 - 8 clusters		94.0124 - 9 clusters		28.9423 - 4 clusters		22.5520 - 4 clusters
103.918 - 6 clusters		88.2561 - 6 clusters		27.2637 - 3 clusters		20.9138 - 3 clusters
	Mean: 191.139			Mean: 97.904			Mean: 29.756			Mean: 22.951



With standardized k-means (seed 0):
4 motion clusters:
==================
Exact:				Approximate:			Coarse:				List:
97.0366 - 8 clusters		49.4288 - 8 clusters		14.3474	- 5 clusters		14.7071 - 5 clusters
97.2876 - 8 clusters		49.2919 - 8 clusters		14.2959 - 5 clusters		14.6751 - 5 clusters
97.2235 - 8 clusters		49.6342 - 8 clusters		14.2895	- 5 clusters		14.6652 - 5 clusters
97.0139 - 8 clusters		49.3349 - 8 clusters		14.2941	- 5 clusters		14.6837 - 5 clusters
97.2806 - 8 clusters		49.3579 - 8 clusters		14.2965	- 5 clusters		14.7096 - 5 clusters

3 motion clusters:
==================
Exact:				Approximate:			Coarse:				List:
203.664 - 9 clusters		92.2545 - 9 clusters		31.2772 - 4 clusters		24.7488	- 4 clusters