The command moyen is used to compute mean values for the UBV data because no avera data are kept in the database. It takes a datatype as argument.
> moyen ubv compute mean ubv data
The command first displays the detailed content of the file and asks if weights are desired. If yes it presents each reference and ask for the weight. It computes the mean values and displays a table showing the number of stars with 1 or more data sources.