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Produce a Continuum image (from all channels, or those selected by the specified Velocity, Frequency or Channel range (depending on Type) between Min Max when the option /RANGE is present), using a Multi-Frequency Synthesis, where (u,v) coordinates are scaled with Frequencies to produce an optimal beam.
Naver is the number of initial channels that will share the same (u,v) coordinates. If not present, it is computed from MAP_FIELD and MAP_CELL to limit bandwidth smearing.
In essence, UV_MAP /CONTiNUUM behaves as the combination of UV_CONTINUUM followed by UV_MAP, but the pseudo-continuum UV Table created by UV_CONTINUUM is not kept by UV_MAP /CONTINUUM.
A spectral index can be specified using option /INDEX.