Difference between the reddening estimates adopted here, from Schlafly & Finkbeiner (2011, S11), and those obtained from the distance-dependent maps by Lallement et al. (2022, L22) as a function of distance from the Sun. Points are colour-coded according to Δ[Fe/H]_{APO − C} = [Fe/H]_APO − [Fe/H]_C. The thick red line is P₅₀ and the thin red lines are P₁₆ and P₈₄ of the distribution of the E(B-V) difference computed over 0.5 kpc wide bins.