Dust mass and optical depth parameter plots. (Upper) Total dust mass (blue), dust mass for grains larger than 0.1 mm (orange) and observed dust mass (green) plotted over the gap location, bump amplitude and bump growth time (from a-c). (Lower) Absorption and observed peak optical depth also in dependence on bump model parameters. The Inner Bump model reaches τ_abs = 35, which is why we used a logarithmic scale in subplot (a).