I've got a couple points of confusion regarding the intensity values at each voxel in the .nii parcellation files (eg tcorr05_2level_all.nii.gz).

1) What are the values at each voxel? I expected they'd be integer values labeling each of the 190 ROIs but they have fractional values instead.
2) Why aren't the values for neighboring voxels the same? I expected that because these ROIs are supposed to be spatially contiguous, neighboring voxels that belong to the same ROI should have identical numerical values/labels.

I'm trying to figure out the best way to threshold ROIs one by one. If I missed some documentation that explains this, feel free to just point me to that. Otherwise, looking forward to your reply. Thanks for sharing these!

Jesse