--> pursuant to finalizing the discussion on this thread, the issue which lead to not seeing a volume was that the gradients hadn't been flipped during the 1dDW_Grad_o_Mat stage. This is discussed more here:
[
afni.nimh.nih.gov]
Also, some volume-viewing tips for SUMA, which are particularly useful for probabilistic tractography output viewing, are now available in the online help documentation as well:
[
afni.nimh.nih.gov]
Finally, a start to the 3dTrackID output help has started here:
[
afni.nimh.nih.gov]
--pt