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Fig. A.2

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Two-dimensional histogram of the 12 μm emission as a function of NH deduced from the τ353 GHz dust optical depth map of Planck Collaboration XI (2014) before (top) and after (bottom) zodiacal correction. The data are from the maps used in the current paper; all maps are at 1° resolution, and only the pixels in the mask shown in Fig. 1 were used to build the histograms.

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