UV_FILTER /ZERO

        [CLEAN\]UV_FILTER [/RESET] /ZERO [/CHANNELS Channel_List]
      [/FREQUENCY F1 [... [Fn]] [/VELOCITY V1 [... [Vn]]
      [/RANGE Min Max [TYPE]] [/WIDTH Width [TYPE]]

    Erase filtered channels (set weight and visibilities to  zero)  rather  than
    simply flagging them (weight set to negative value). This can be more conve-
    nient for further display, but is not reversible.

    By  default, channels to be filtered are flagged (weights becoming negative,
    and data can be unflagged by UV_FLAG).  Flagged channels are ignored in  the
    averaging  process,  such as UV_RESAMPLE or UV_CONT.  However, as UV_MAP (in
    general) uses only one channel to define the weights for all  others,  these
    flagged channels will nevertheless appear in the imaged data cube.

    See  UV_CHECK  for information about handling flagged channels and different
    beams in a single UV table.