Fig. A.1
Surface density profiles of atomic hydrogen HI (top), molecular hydrogen H2 (middle) and total gas ΣG = 1.4 (HI+H2) (bottom). Disk data (beyond 2 kpc) are from: Dame (1993), solid; Olling & Merrifield (2001), dotted ; and Nakanishi & Sofue (2003, 2006), dashed. The dot-dashed curve in the HI panel corresponds to data from Kalberla & Dedes (2008) and in the H2 panel to data from Pohl et al. (2008). Bulge data (inner 2 kpc) in all panels are from Ferrière (2001).
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