UV_FILTER /RANGE

        [CLEAN\]UV_FILTER [/RESET] [/ZERO] /RANGE Min Max [TYPE]

    Indicate  that  channels  between  the First and Last defined by Min Max and
    Type contain line emission and should be filtered out.  Type can be CHANNEL,
    VELOCITY or FREQUENCY.

    For type CHANNEL, Min and Max indicate offsets from Channel  1  and  Channel
    Nchan (the number of channels in the data set). Thus Max can be negative: it
    then  indicates  Last  = Nchan-Max. Also Min=0 and Max=0 implies loading all
    the channels.