Elliptical profiles of the GDR for M 33 for different values of X(CO). The differences in the profiles are more notable at R < 4 kpc, where the molecular gas mass fraction is high. At R > 4 kpc, the molecular hydrogen surface density, , is considerable smaller than the atomic hydrogen surface density, ΣHI (Druard et al. 2014; Gardan et al. 2007).
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