[Freesurfer] Manual segmentation to volume

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Dear Freesurfer experts,

I have a manual segmentation of a certain brain feature done in Freeview. I want to pool these segmentations from different subjects to create some kind of a heat map/probability map.

In order to do this, I assume I need to convert my segmentation to a volume first (In my case the Talairach space); hence, I tried:

mri_label2vol --seg example.mgz --temp talairach.xfm --o seg_talairach --reg example_orig.mgz

the example_orig.mgz would correspond to the original T1 which I used to do the segmentation.

But this gives me the error message:

ERROR: could not determine type of talairach.xfm

ERROR: reading talairach.xfm header

Where is the problem?

Many thanks!

/Ben