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UV_FILTER /VELOCITY 

        [CLEAN\]UV_FILTER [/RESET] /VELOCITY V1 [... [Vn]] [/WIDTH Width [TYPE]]

    Specify around which velocities the line emission should be  filtered.   Ve-
    locities  V1  to  Vn must be in km/s. The full width of the filtering window
    around every frequency can be set by option /WIDTH.  The  optional  argument
    TYPE  indicates the type of width: FREQUENCY (in MHz), VELOCITY (in km/s) or
    CHANNEL (no unit), the default being FREQUENCY.  The default  width  is  the
    current channel width.