UV_ADD

        [ADVANCED\]UV_ADD ITEM [Mode] [/FILE FileIn FileOut]

      Compute and add some missing information  in  a  UV  Table,  such  as  the
    Doppler correction and the Parallactic Angle

    The  information is derived from the Observatory coordinates, from the Tele-
    scope name in the input UV table. This can be supplied by the SPECIFY  TELE-
    SCOPE command if not available.

    ITEM can take values DOPPLER, PARALLACTIC or * for both.

    Mode is a debug control integer which indicates in which column the informa-
    tion  should  be  placed. The default is 0, i.e. the command will re-use the
    column of the appropriate type, or add it if not present.  It may be set  to
    3,  as  often column 3 contains the Scan number, which is not a relevant in-
    formation for imaging.  Other values are at the user's peril...