7 allows specification of a direct sunlight correction file, generally a file for cosine correction. 8 allows specification of a reflected skylight correction file, generally for a cosine correction. 9 allows specification of a direct sunlight grid file. All filenames can include a DOS path in standard DOS format. A allows specification of a reflected skylight grid file.
C allows specification of the magnetic declination for use in the grid overlay.
Without such distortion, the aspect ratio should be 0.833333. E allows specification of the label alignment grid. The label alignment grid appears as 3 horizontal lines in graphics overlay and is used to position photographs relative to labels imprinted by a camera databack. F allows specification of the 21 azimuth angles used in the reflected skylight distribution file. These azimuth angles do not affect the calculations in the program, but rather are used as labels in the tables of results.