From left to right: Visual extinction maps derived from Rowles & Froebrich (2009); Juvela & Montillaud (2016); Green et al. (2015) with the extinction law of Cardelli et al. (1989). The blue and red contours correspond to pixel selections at 0 < AV < 1.6 mag and at AV > 4 mag, respectively, in regions where NH > 4.5 × 1021 cm−2. These selections in AV and NH are shown as the blue and red areas in Fig. A.3. The (l,b) directions that do not match both conditions have been masked to generate the contours that encompass the selected pixels.
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