a) Time evolution of accretion time scales for silicate and carbonaceous grains (thin and thick lines) for Models 1–3 (solid, long-dashed and short-dashed lines, respectively). b) Dust-to-gas mass ratio (DGR) evolution with time from the onset of galaxy formation for Models 1–3 shown with the same line types as in the top panel. Thick and thin lines show the total DGR and the DGR calculated with only the ISM-grown dust.
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