Distribution of TNG100 galaxies as a function of sSFR and specific dust mass, adopting our fiducial dust-to-metal ratio of 0.5. Colored lines indicate running medians in different stellar mass bins. To guide the eye we also show observational data (medians and 16th-84th percentile ranges) from Donevski et al. (2020) for a sample of star-forming galaxies with 0.5 < z < 5.5, confirming that the TNG100 dust masses are plausible.