Visibility curves with the one-component model, for an outburst with ΔT_outburst = 25 000 s, a size distribution in a^-4 with a_max = 100 mm, a velocity law V_dust(a) = V₀   (a/a₀)^-0.5 with V₀ = 35 m s^-1 being the velocity of 1-mm particles, and an outburst onset t₀ = 23.8 UT. Data are shown by filled circles with error bars. The solid curves show the model results. Black (red) symbols and curves are for 27 and 28 October, respectively. Dust particles are made of a porous (50% porosity) mixture of astronomical silicates and ice, with an ice mass fraction of 48%.