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Hi Bruce,
Thanks for the quick response.
I found that the problem was the input. If I use the EPI that it is coregistered to the T1 of Freesurfer instead of the EPI that it is also normalized to the MNI space, it works and I can project the surface (that I created with the command that I sent you) on fsaverage 5.
Could you confirm that the command has no errors?
mri_vol2surf --mov EPI.nii --reg register.dat --hemi [l/r]h --projfrac 0.5 --interp trilinear --trgsubject ico --icoorder 5 --o EPI_surface.mgh
Best wishes, Marina