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