Colour counts: source surface density as a function of the SPIRE colour, S350/S250 (left), and S500/S350 (right). Histograms are: red solid line, Planck IN; black line, Planck OUT; green, Planck IN lensed fields only; blue line, z< 1 HLS clusters; and orange dashes, Lockman SWIRE. The Planck IN sources (total and/or lensed sources) show a much higher surface density than other samples, owing mainly to our all-sky search strategy. See Sect. 4.3 for details.
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