Stacks of SPIRE 350μm data (8.7′ × 8.7′): a) 220 PlanckHerschel fields; b) 278 HLS clusters; c) 500 sources in the HerMES Lockman field, peaking at 350μm; and d) 500 random positions in the HerMES Lockman field. Black contours show the density of red sources (using AKDE). Our Planck fields clearly exhibit a high significance of extended (a few arcminutes) submm emission, due to the presence of many red point sources, not seen in the HLS or HerMES sources. See Sect. 6.2 for details.
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