Selection of red giants that do not have some photometric data

The red giant stars in a cluster have not been all observed in the UBV, DDO or Geneva photometric systems. To know which stars not have been measured in a given photometric system, use a command gk like

gk -ne "data type"

To know which stars have been observed, see the previous item.

The keys for the photometric systems are identical to the data types defined throught the database:

ubv , pgh , gen , ddo , ri , egg , iyz , wing .

Example:

gk -ne ddo lists the red giants which do not have DDO mesurements