Hi Joel,

It's nice to have an example to illustrate the issues that you are
talking about. But your axial+orig dataset looks very strange to
me. The orientation appears to be RAS, yet the A to P coordinates
go from +99 and desend with a DELTA of -0.9375. That does not seem
right, as that should correspond to a dataset in RPS orientation,
not RAS.

How did you create this dataset? Was this with an AFNI program, or
in some other way? If you are interested in uploading it so I can
see, please see the upload link at the top of the main Message Board
page.

As for your comments about the layout change when going to tlrc
orientation, note that AFNI uses RAI orientation for Talairach
datasets. But I think the Talairach space, by definition, is from
ORIGIN -80, -80, -65 (RAI) on up, with a 1 mm^3 resolution.

But anyway, the problem seems to be with your axial+orig dataset.
Any details you can provide would be helpful.

- rick