Fig. B.2
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Left panel: gas surface density time evolution at 4, 8, 12, and 16 kpc. The present-day observed value for the solar vicinity is taken from Dame (1993); Nakanishi & Sofue (2003, 2006). Right panel: present-day radial gas surface density gradient. The dashed curve is the average between the Dame (1993) and Nakanishi & Sofue (2003, 2006) data sets. The grey shaded region represents the typical uncertainty at each radius (see Palla et al. 2020b for more details).
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