for data:
[[ 0.   1. ]
 [ 1.   0.1]
 [ 0.9  1. ]
 [ 0.7  0.6]]
with "means":
[[ 0.    0.1 ]
 [ 0.95  1.  ]]
the indices are :
[[0]
 [1]
 [1]
 [1]]
and each point is this distance from the mean of its cluster:
[[ 0.9       ]
 [ 0.90138782]
 [ 0.05      ]
 [ 0.47169906]]