Model results as a function of dust velocity parameter V₀ for astronomical silicates with 0.5 porosity and 48% ice fraction. The outburst onset is t₀ = 23.8 UT and the maximum dust size is a_max = 100 mm (top figures a) and c)) and a_max = 1000 mm (bottom figures b) and d)). Results for size indexes of q = −3 and q = −4 are plotted respectively with solid, and dotted lines, and full circles, and crosses. Left: visibility curves and interferometric-flux characteristics:  at r_uv = 20 m (red) and 70 m (blue); interferometric flux ratio F_{27   Oct.}/F_{28   Oct.} (green); index q_v of visibility curve on 27 October (black). The measured values and their error bars are shown by dotted horizontal lines, and vertical lines, respectively. Right: reduced χ² from data fit: 27 October data (red), 28 October data (blue), 27 and 28 October data (black).