Dear FreeSurfer experts, How does one properly convert from surfaceRAS coords, as provided by fs_read_surf.m, to talairach coords? I have tried using freesurfer_surf2tal.m posted on the web by Darren Weber, supplying it with transform data from transforms/talairach.xfm, but the values returned often differ from those in tksurfer by as much as 20mm (and are clearly wrong). What I would like to do is match the coordinate system in tksurfer (which is clearly right). How does tksurfer do it?
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