Dust-to-stellar mass ratio as a function of UV-to-optical colour of the GRB 980425 host (red square), LMC (open red square; M∗ from Skibba et al. 2012 and Md derived applying the method of Bianchi 2013 to the data from Meixner et al. 2013), KINGFISH galaxies (blue plusses; Kennicutt et al. 2011), and the averages of other local galaxies in eight colour bins (Table 1 and Fig. 4 of Cortese et al. 2012). The solid line represents a linear fit to the data, which results in Md/M∗ = −1.87 ± 0.07 at the host colour of NUV − r ~ 1.5, close to the measured value of Md/M∗ ~ − 2.1. The WR region is off this plot with NUV − r ~ − 0.15 mag and Md/M∗ ~ − 2.1.
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