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Influence of the density distribution in the local ISM (silicates with a 5 nm thick mantle and carbons with a 20 nm thick mantle). Cold neutral medium (CNM) with nH = 25 to 70 H/cm3 is shown in pink, CNM with nH = 100 H/cm3 surrounded by Warm Neutral Medium (WNM) with nH = 1 H/cm3 is plotted in yellow, and WNM with nH = 1 H/cm3 is displayed in turquoise. The three models overlap in the figures. The radiation field is also varied with . In panels d), e), and f), seven lines of the same colour are plotted. Each of these lines corresponds to a different value of G0. For instance, in panel f), the turquoise lines from left to right correspond to G0 = 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, and 1.4, respectively. The models falling below the observed E(B − V) to ℛ ratio are those illuminated by an ISRF scaled with G0 = 1.3 and 1.4. See Sect. 2.2 for description of the black and white lines and symbols.
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