OPT: output angle of the centerline with respect to the inferior-superior direction (in degrees)                - per slice                - average across selected slices or vertebral levels
OPT: output angle of the centerline with respect to the inferior-superior direction (in degrees)
               - per slice
               - average across selected slices or vertebral levels

Former-commit-id: 2219ffba86f0bc743b853c058605375a22137537 [formerly 1e2d624b0e186c9f4778f67019c49fd2834633a2]
Former-commit-id: cb6480f2983b18936e5a2b656e2758ea23fab155
Former-commit-id: cfe6d5d48180ca0fe24e847e293201466e3add31
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox