mri_segment -wlo 87.7  -ghi 103.3
mris_make_surfaces -min_gray_at_white_border 79.4  -max_border_white 109.3  -min_border_white 90  -max_csf 68.7  -max_gray 98.7 -max_gray_at_csf_border 84.7  -min_gray_at_csf_border 58.1