Keywords: imager

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### Implementation issues

The new implementation of [rgb]1,0,0IMAGER and in particular of the magenta`UV_MAP` and magenta`CLEAN` commands uses most of the older code, but re-arranged such that ensembles of contiguous channels (``chunks'') are treated at once and share the same synthesized beam. Deconvolution with magenta`CLEAN` then proceeds by using the synthesized beam with the appropriate frequency for each channel. The user can control the ``chunk'' size, and hence the precision of the process given the desired field of view.

As a result of the new concept, beams (whether primary or synthesized) can be 4-D arrays, as they may depend on Frequency and Field.