Hello, I try to map the surface to the native space, using the following command adjusted for my data:

mri_surf2surf --sval-xyz pial --reg register.native.dat rawavg.mgz --tval lh.pial.native --tval-xyz --hemi lh --s subjectname

the output is: ERROR: --tval-xyz flag needs 1 argument FYI: --tval-xyz now requires a volume.

So in the web-page ( http://surfer.nmr.mgh.harvard.edu/fswiki/FsAnat-to-NativeAnat) the comand is not correct.

What kind of volume can I put, to get the surface in the native space?

Thank, Silvia