Keywords: clic

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### Flag

`STORE FLAG` is the command to be used if one wants to flag data. Many keywords are available and flags can be stored for antennas or baselines. Two basic kinds of flag exist: the spectral flags, which will flag individual spectral windows and the non-spectral flags, that flag all of the data.

Flags are available at the dump level in the IPB, as they are recorded on the second basis by the online system. In the hpb file, they are stored in the data modified section, and only one value per observation is kept. In the case when one uses an hpb file, the actual flag will be a logical `.or.` of the IPB and hpb flags.

An option exists to store the flags only in memory if they are to be reset after some operation, as it is much more efficient. Command `MASK` allows to mask a given flag, while command `MARK` can be used to set a given flag (for all observations, contrary to the `STORE FLAG /MEMORY` option that works on the current index).

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