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Application of flags to the data

Pieflag does not modify the flagging tables of Miriad data sets directly. Instead, it writes a shell script to disk which has to be executed to apply the flags. The script is only a sequence of Miriad ``uvflag'' commands with the appropriate selection of baselines, channels, and times. The advantages of having a script are that the flags can be re-applied later, without running Pieflag again, and that a record is kept of how the flagging was done, in the form of comments at the beginning of the script.