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BEAM_STEP Integer
Number of channels per synthesized beam plane.
Default is 0, meaning only 1 beam plane for all channels. N (>0) indicates N consecutive channels will share the same dirty beam.
A value of -1 can be used to compute the number of channels per beam plane that ensures that the angular scale does not deviate more than a fraction of the map cell at the map edge. This fraction is controlled by variable MAP_PRECIS (default 0.1)