Comparing two sources of CCD data

Without argument, ccd -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 CCD data.

The same result may be obtained with the command compar in the form: compar ccd

If an argument is given, corresponding to a compar in the form: compar ccd pgh

The program offers also the possibility of a graphical output, with a menu.

Exampls:

ccd -c starts the comparison of the CCD photoelectric data:

 Enter the first reference ccd:  324

 Enter the second reference ccd:  1341

 Give the number of stars to suppress:  0

ccd -c pgh starts the comparison between the CCD pe and CCD data:

 Enter the first reference ccd:  498

 Enter the second reference pgh:  32

 Give the number of stars to suppress:  0