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.