Evolution of M_dust/M_⋆ with M_⋆ in observed dusty QGs. Upper panel: evolution of M_dust/M_⋆ with M_⋆, colour-coded as a function of galaxy size (represented with effective radius, R_eff, in kpc). Median values in different stellar mass bins are displayed with brown circles and squares for sQGs and eQGs, respectively. The typical errors are shown as brown crosses. The straight lines are the best linear fits that describe the data for sQGs and eQGs. Line symbols and fitting functions are indicated in the legend, and the shaded regions represent 95% confidence intervals of the fit. Lower panel: evolution of M_dust/M_⋆ with M_⋆ in sQGs (left) and eQGs (right) as a function of time after quenching (t_quench). Coloured lines show the evolution of the specific dust mass (as median values in three stellar mass bins) for different post-quenching intervals. The meaning of the coloured lines is indicated in the legend.