I have a question on how to manually edit the pial surface. My structure data are fully processed using recon-all -all. Then I go back to look at the white/pial surface and sub-cortical boundaries. In some data, I found the gray matter is not included in the pial surface. I looked at the freesurfer archive, got some idea of how to edit the pial surface by removing and painting the brainmask.mgz and T1.mgz, but it does not tell me how to change the pial surface to include the gray matter that should be inside pial surface. May someone please give me a help? Thanks.