BUG: fixed bug related to smooth function call
BUG: fixed bug related to smooth function call

Former-commit-id: a9fe81525fd5a130216ab664299df35a8266832d
Former-commit-id: ad35f48c4ac5feed3c69eaa9b13af2f18492e081
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox