ARDQUAL = QUALITY IGNORE=Y FSEL=Y i.e. invoke QUALITY in IGNORE mode, and use a spatial file to define the ignored region IGNORE = QUALITY IGNORE i.e. invoke QUALITY in IGNORE mode RESTORE = QUALITY RESTORE i.e. invoke QUALITY in RESTORE mode SETQUAL = QUALITY SET i.e. invoke QUALITY in SET mode. All keywords are the same as for QUALITY, but obviously you don't define a mode!