Masks and complementary selected large regions that retain fractional coverage of the sky fsky from 0.8 to 0.3 (see details in Sect. 3.3.1). The grey is the CO mask, whose complement is a selected region with fsky = 0.8. In increments of fsky = 0.1, the retained regions can be identified by the colours yellow (0.3) to black (0.8), inclusively. Also shown is the (unapodized) point source mask used.
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