Distribution of the diameters resulting from fitting our models to the 86 GHz and 230 GHz datasets. The data are the same as in Fig. 6, here shown split into the time steps before and after t = 24 000 M. The black outline shows the total distribution, corresponding to that of Fig. 6. The vertical lines show the observational range for the diameter of the ring, using the same values as Fig. 6.