SED-derived DTG ratio, DTG_SED = A_V/N_HI (top), and depletion-derived DTG_mass (bottom) as a function of dust-corrected metallicity, [M/H]_tot. The symbol notation follows Fig. 3. We find strong correlations between the DTG inferred both from the SED (top panel) and from depletion (bottom panel) with the metallicity. In the bottom panel we also show the predictions from the Simba simulation at z ∼ 0 − 6 (dotted blue line; Li et al. 2019) and the L-Galaxies MM simulation at z ∼ 2 − 6 (dashed lines; Yates et al., in prep.). The dashed orange line is the limit at which all metals are incorporated into grains (DTM = 1).