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Fig. 4

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Histogram of residual emission at 857 GHz after subtraction of the dust emission associated with HI gas. The blue solid line is a Gaussian fit to the core of the histogram, with dispersion σ = 0.07 MJy sr-1. We mask pixels where the absolute value of the residual emission is higher than 3σ. The positve (negative) wing of the histogram beyond this threshold represents 7% (2%) of the data.

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