Hi FreeSufer Experts, 

I would like to do a figure like this one published in High-Resolution Intersubject Averaging and a Coordinate System for the cortical Surface (1999, Fischl et al.). I would to superimpose the isocontour of average curvature (for example fsaverage) on a subject's curvature before and after registration. How can I do this with tksurfer ? 

Thanks a lot for your help !

Sophie