Fig. A.2
Average profiles of the previous figure. Top: atomic and molecular hydrogen; middle: total gas ; bottom: fractions of gas (solid) and molecular gas (dashed). For the latter panel, an exponential stellar density profile with a scale-length of 2.3 kpc normalised to Σ∗(R = 8 kpc) = 38 M⊙/pc2 is adopted, while the molecular fraction is evaluated with the formalism of Appendix B.
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