SECTION./CENT
MAGNITUDE/CENTER [in_specs] [out_specs] [Fsiz,Nsiz,Bsiz] [out_opt]
                 [center_params] [curs_specs] [zw_option]
	compute magnitude in center
SECTION./CIRC
MAGNITUDE/CIRCLE [in_specs] [out_specs] [Fsiz,Nsiz,Bsiz] [out_opt]
                 [center_params] [curs_specs] [zw_option]
	compute magnitude within circular aperture
SECTION./RECT
MAGNITUDE/RECTANGLE [in_specs] [out_specs] [pix_area] [out_opt]
	            [center_params] [curs_specs] [zw_option]
	compute magnitude within square aperture
