Create a new SGS zone from the current picture. The zone will be created with the coordinate system of the current picture. If the device associated with the current picture is not already open then this routine will open it, and additionally the zone will be cleared if the access mode is ’WRITE’ (in AGI_ASSOC or AGI_OPEN).

CALL AGS_NZONE ( NEWZON, STATUS )

NEWZON = INTEGER (Returned)

STATUS = INTEGER (Given and Returned)