REGION

     REGION specifies an areal location.

     In GPBOX, REGION may be VIEW, PLOT or DEVICE where:

	VIEW corresponds to the view region (includes margins);

	PLOT corresponds to the plot region (excludes margins);

	DEVICE corresponds to the entire device space.
 
     In OABOX, the region must be GRID, DATA, or EXTEND where:

	GRID corresponds to the area over which the objective
	analysis is performed;

	DATA corresponds to the area from which data will be
	extracted for the objective analysis;

	EXTEND corresponds to the extended grid area over which 
	the first pass of the objective analysis is performed.