pgh -c allows to compare the various sources of
UBV photographic data.
Without argument, pgh -c starts a program which asks for
the two reference numbers to be compared and the number of stars to
suppress from the comparison, if any. The comparison is done on the
photoelectric data.
The same result may be obtained with the command
compar in the form: compar pgh
If an argument is given, corresponding to a
compar in the form: compar pgh ccd
The program offers also the possibility of a graphical output, with a menu.
pgh -c starts the comparison of the UBV photographic data:
Enter the first reference pgh: 324 Enter the second reference pgh: 1341 Give the number of stars to suppress: 0
pgh -c ccd starts the comparison between the UBV pg
and CCD data:
Enter the first reference pgh: 498 Enter the second reference ccd: 32 Give the number of stars to suppress: 0