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Can you describe how the FS stat Total cortical gray matter volume is calculated from the files in the freesurfer subject directory? Is there an mgz file where each voxel has an estimated percentage grey matter here as the value... or is the volume between the surfaces calculated somehow? Thanks, Ian _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer