[pymvpa] >what does 405X 42696 in the dataset mean?

[Yune Lee]

 Dear pyMVPA experts,
 I just loaded my dataset using dataset class and python spits out the
summary as belows

 >>  Dataset / float64 405X 42696 uniq: 5 chunks 2 labels.

 The bold nii.gz was created by concatenating 925 3D volumes (185 images per
each run and there are 5 runs (185*5)).
 I'm just wondering how 405X 42696 comes out from my data structure.
 Can any one explain what it means?

 Thanks,
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