mri_vol2vol --targ $FREESURFER_HOME/subjects/cvs_avg35/mri/norm.mgz \
            --m3z $SUBJECTS_DIR/$subj/cvs/combined_tocvs_avg35_elreg_afteraseg-norm.m3z \
            --noDefM3zPath --reg $TUTORIAL_DIR/$subj/dtrecon/register.dat \
            --mov fa-masked.mgz \
            --o fa-masked.ANAT+CVS-to-avg35.mgz \
            --interp trilin --no-save-reg

However, how would one take take a volume in CVS template space and reverse normalize it back to subject diffusion space? Is this possible? If so, what would that command look like and what other steps would be necessary to get the required inputs?