ccd manipulate the UBV CCD data
corresponding to the data type ccd. The CCD
data are contained in the file ubv.ccd.
The command ccd presents
options common to all commands
and offers additional options to get mean value,
references and perform selections.
The similar commands
ubv,
pgh,
cam,
sit manipulate the other UBV related
data types.
The various possibilities offered by the command ccd are: