Fig. A.3.

Volume density radial profiles of the atomic gas (left), the molecular gas (centre), and the total gas (right) from the literature (Li92 = Liszt 1992, KK98 = Kalberla & Kerp 1998, NS = HI from Nakanishi & Sofue 2003, and H2 from Nakanishi & Sofue 2006; see caption of Fig. A.1 for the other labels in the legend) compared to the profile adopted in this work (black points). The factor 1.36 for the helium correction is included.
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