Fig. 4
Molecular hydrogen fraction (fH2, top) and cosmic-ray ionization rate (ζH, bottom) vs. galactocentric radius in the z = 0.89 absorber toward PKS 1830–211 (the two red stars) and in the Milky Way (light gray dots: foreground clouds only, taken from Indriolo et al. 2015; black dots: same Galactic entries, but weighted-averaged over 1 kpc bins).
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