Top: 2D histograms of the correlations between the AV data and the dust optical depth at 353 GHz (Planck Collaboration XI 2014) or the total gas column density, NH γ, measured with 0.4–100 GeV interstellar γ rays (Remy et al. 2017) (bottom). All the maps are compared at a common angular resolution in 0. °25 × 0. °25 bins. The orange line in the top plots corresponds to a ratio AV∕τ353 = 4.62 × 104 mag (Planck Collaboration XI 2014). The green line in the bottom plots corresponds to a ratio AV ∕NH = 5.34 × 10−22 mag cm2 (Bohlin et al. 1978). In each panel the magenta line corresponds to the best fit of a linear regression. The blue and red areas correspond to the pixel selections used to generate the contours in Fig. A.1.
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