This article has an erratum: [https://doi.org/10.1051/0004-6361/201117056e]
Comparison of our values for MH2/MHI (black stars) to those from the literature: Casoli et al. (1998) (blue triangles), Young & Knezek (1989) (red crosses), Leroy et al. (2008) (blue circles) and Nishiyama & Nakai (2001) (magenta squares). The molecular gas mass have all been adapted to a common conversion factor of 2 × 1020 cm-2 and no consideration of the helium mass.
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