2D histograms of the correlations between the visual extinction maps derived from Rowles & Froebrich (2009), Juvela & Montillaud (2016), and Green et al. (2015) with the extinction law of Cardelli et al. (1989) (RV = 3.1, AV∕AJ = 3.55). All the maps are compared at a common angular resolution in 0. °25 × 0. °25 bins. The yellow lines correspond to a one-to-one correlation. In each panel the magenta line corresponds to the best-fit of a linear regression.
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