REF: updated class definition
REF: updated class definition

Former-commit-id: 0589c759afde78be8452b92b7a3c475fcc50818a
Former-commit-id: 06690104f44e749d00a28d1d1e0e4b41ebeb02fd
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox