Comparing two sources of UBV data

Without argument, ubv -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 ubv

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

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

Exampls:

ubv -c starts the comparison of the UBV photoelectric data:

 Enter the first reference ubv:  324

 Enter the second reference ubv:  1341

 Give the number of stars to suppress:  0

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

 Enter the first reference ubv:  498

 Enter the second reference ccd:  32

 Give the number of stars to suppress:  0