Modify the parameters in the SUBJECTS group in the c3d file.
Modify_C3D_Subjects_Parameters ! /USED= ! /IS_STATIC= ! /USES_PREFIXES= ! /NAMES= ! /LABEL_PREFIXES= ! /MARKER_SETS= ! /DISPLAY_SETS= ! /MODELS= ! /MODEL_PARAMS= ! /OVERWRITE_C3D_FILE=FALSE ;