use the same number of points & gap as before
use the same number of points & gap as before


Former-commit-id: d3ee60959d6918fce093121bca48a452f4d393a4
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox