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Transform the (presumably spectral line) UV data set loaded by READ UV into a "continuum" data set.
The transformation selects line channels defined by the /RANGE option, average them by groups of Naver contiguous channels, and concatenate the resulting visibilities into a "continuum" UV table. If not present, Naver is derived from the current field of view MAP_FIELD and required precision, MAP_PRECIS to avoid bandwidth smearing at field egdes.
For each output channel, and for all visibilities, the U and V coordinates are rescaled to the mean observing frequency, and the resulting (single-channel) visibilities are concatenated into the "continuum" UV data set. The continuum dataset becomes the current UV data. Flagged channels are ignored: this allows to mask channels containing spectral lines (see UV_FILTER).
If no /RANGE option is defined, all channels are selected.