SPIRE maps at 250, 350, and 500μm of one typical overdensity in our sample (a Planck cold source of the CIB). The thick white contour at 350μm shows the Planck IN region at 857 GHz, and the same is true for the map at 500μm at 545 GHz (i.e., the 50% contour of the Planck source maximum). Thin contours correspond to the overdensity of SPIRE sources at each wavelength, marked at 2σ, 3σ, etc. (see Sect. 4.2 for details). SPIRE identifies a few (typically 5 to 10) sources inside the Planck contour. We use these contours to separate the IN and OUT zones. These data come from a 7′ × 7′ SPIRE scan (see Table 1 and Sect. 2.3).
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