Upper panel: sMdust vs. sSFR for LBGs (black triangles) and DGS galaxies (red dots) overplotted with models characterised by different choices of the mass-loading factor and inflows as indicated in the legend. For all models, we select a value of τ = 300 Myr in Eq. (1), α = 1.35 for the top-heavy IMF in Eq. (3), and M_swept = 6800 M_⊙ in Eq. (8), M_gas = 50 × M_stars, and a dust condensation fraction for SNe II of 50%. Lower panel: metallicity vs. sSFR for DGS galaxies overplotted with the same models as in the upper panel.