Fig. 7
Top-panel: dust-to-gas mass ratios against metallicity for Virgo SFDs. The solid line indicates a linear scaling of the Milky Way dust-to-gas ratio and metallicity which holds for galaxies with 12 + log (O / H) ≳ 8.1. The total gas mass here is calculated considering the total Hi mass from ALFALFA observations. Bottom-panel: same as upper panel. The total gas mass here is calculated considering only the Hi mass within R25, as explained in Sect. 7.3.
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