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Fig. 9.

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Metallicity vs total hydrogen column density. The different lines correspond to the hydrogen column density of a single H2 cloud illuminated by a UV field for different UV to density ratios IUV/n as indicated above each line, with IUV in units of the Draine field and n in cm−3. Filled symbols correspond to H2-bearing systems. Proximate H2 systems are from this work, proximate DLAs from Ellison et al. (2010), and intervening systems from Noterdaeme et al. (2008) and Balashev et al. (2019).

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