18.32 UV_FILTER

[CLEAN\]UV_FILTER [/RESET] [/ZERO] [/CHANNELS Channel_List] [/FREQUENCY List Of Frequencies] [/RANGE Min Max [TYPE]] [/VELOCITY List of Velocities] [/WIDTH Width [TYPE]] [/FILE FileIn [FileOut]]

"Filter" line emission, by flagging the corresponding channels. The channels can be specified either by the /FREQUENCY or /VELOCITY options in combination with the /WIDTH option, or by a channel list with /CHANNELS or a range (of channels, frequencies or velocities) with /RANGE.

By default, channels to be filtered are flagged (weights becoming negative). Option /ZERO can be used to erase them: weights and visibilities are set to zero, see HELP UV_FILTER /ZERO. On the contrary, option /RESET can be used to unflag them (and is thus conflicting with option /ZERO).

The command works on the current UV data, unless the option /FILE is specified.

With no options (except possibly /FILE and /ZERO), the command behaves as UV_FILTER /CHANNELS Preview%Channels. See UV_PREVIEW for details.