H2 population distribution along different lines of sight at a time t = 20 Myr, using an ortho-to-para ratio of 0.7 (top), and at thermal equilibrium (bottom). The symbols correspond to the observational data of Wakker (2006) (cross), Rachford et al. (2002) (circle), Gry et al. (2002) (square), and Lacour et al. (2005) (diamond). Colours correspond to the total column density range.
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