Dear FreeSurfer Community... what is the best approach to co-register a single subject to fsaverage space and for the results to have identical number of vertices and faces as fsaverage???  will it work by specifying a single subject in the make_average_surface command?? in other words is the sum of two individual averages (i.e., make_average_surface --subjects subjectA and make_average_surface --subjects subjectB) equal to make_average_surface --subjects subjectA subjectB???

Any guidance is greatly appreciated.

Rachel