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The COMPARE command has two modes: comparison of two maps (map mode) or comparison of two data cubes (cube mode).
In the cube mode, the COMPARE command is in many respect similar to the VIEW command, in that it presents at the same time integrated values (maps and spectra) and individual spectra and channel maps. However, it does so for two datacubes at once, allowing a side-by-side comparison between them, as shown in Fig.13.
It is convenient to compare e.g. two epochs, or two different spectral lines observed towards the same source.
In the map mode, COMPARE is similar to the SHOW command, but the two maps are presented side by side with their respective headers above each (see Fig.13). The first (left) one controls the sizes, contours and color range if not specified by the user. The two maps can be planes of data cubes, e.g.
COMPARE CLEAN[6] DIRTY[12]
In both modes, only relative coordinates are used. No absolute position mode is available so far, so beware of ensuring that the map centers are identical if you want to compare results at identical positions.
