Differential Euclidean-normalized number counts, S2.5dN/ dS, for various data sets (not corrected for flux-boosting or incompleteness) used to measure the relative behaviour. Symbols show: Planck IN region (red circles, 228 fields); Planck OUT regions (black circles); Planck whole field, i.e., IN+OUT (blue circles); sample of 535 z< 1 clusters of the HLS (open square); and HerMES Lockman SWIRE blank field (crosses). Our SPIRE sources corresponding to the Planck IN regions clearly show an excess in number density at 350 and 500μm, illustrating their red colour, and a potentially higher redshift than average. See Sect. 4.1 for details.
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