Left: joint 2D histograms of polarization fraction p and column density NH. Red dashed lines show the location of pmax = 19.8% from PlanckXIX. The green lines follow the maximum Cbin as a functionof NH, and the blue lines represent the weighted mean of p. Right: sample maps of p. The polarization fractions are weakened in the galactic midplane, which is seen in the 2D histograms as a growing distribution of low p at high NH. For Rmax = 1 kpc, see Figs. 13 and 14.
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