Normalized histograms of the S/N values for the pixels within the portions of the 850 and 450 μm maps characterized by less than three times the central noise. The orange and blue histograms indicate the distributions of the jackknife maps, and of the data, respectively. The jackknife maps represents the pixel noise distributions that dominates at low S/N (see Sect. 3.1 for details). The data (especially at 850 μm) shows excesses at high S/N where sources contribute to the distributions. The matched filter technique introduces residual troughs around bright detections, which are visible here as negative excesses.
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