UV_FLAG

        [CLEAN\]UV_FLAG [/ANTENNA Iant] [/DATE ...] [/FILE FileIn [FileOut]]
      [/RESET]

    Without the /FILE option, display the current UV data and calls  the  cursor
    to  interactively select a region where UV data will be flagged or unflagged
    (sign of weight is made negative or positive). The /RESET option is used  to
    unflag the data.

    UV  data  flagged  using  command  UV_FLAG can be saved on file with command
    WRITE UV File. Detailed information about the display control of the UV data
    may be found in the SHOW UV help.

    See HELP UV_FLAG /FILE for direct operation on a UV data file.

    Subsequent mapping with UV_MAP will ignore flagged data. However, for multi-
    channel imaging, the weight column is (by default) taken from  one  channel,
    so  that  channel-based  flagging  is  will not be recognized in the default
    mode, but only in the "One Beam per Channel" mode.