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Fig. 17
Left panel: case of a source at 250 μm, labelled 117, in which the peak/background contrast is ~ 1 (hence relatively high, see Fig. 14), but the S/N is only 2.1. Right panel: case of a source at 250 μm, labelled 1251, with a very good S/N of 13.5, but with peak/contrast ratio ~ 0.15.
This figure is made of several images, please see below:
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