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The CONTINUUM image can also be produced from a (deconvolved) spectral line data cube by the MAP_CONTINUUM command. Compared to the method presented in Sec.11.1, this has the advantage of being able to handle spatially variable spectral index, and also spatially variable spectral line contamination. It has the drawback of limited S/N for the deconvolution, as already mentionned, unless the spectral line data cube also contains the continuum emission using one of the two methods presented in Sec.11.2-11.3.
Also, the CONTINUUM image can be read from a GILDAS data file using command READ CONTINUUM. And of course, it can be written to GILDAS data file by command WRITE CONTINUUM.