Fig. A.1

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LOS-uncorrected column density of the Aquila cloud expressed in visual extinction. The white dashed rectangle indicates the region used for evaluating the LOS-contamination by (i) taking the mean of all pixels inside the rectangle (AV = 2.5) and (ii) constructing an N-PDF from these pixels and determining the peak of the distribution (AV = 2.4, see Figure A.2).
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