Evolution of maximum (total) dust density with time for three polydisperse simulations with n = 5, 10, and 20, as well as the monodisperse run10. The short horizontal lines to the left indicate averages between 60 and 100Ω⁻¹ and the vertical dotted line indicates the settling time for the monodisperse run10 (with a stopping time τ_s = 0.037 equivalent to the average stopping time of the polydisperse runs).