Results from the two dimensional statistical analysis (i.e., adopting no mass dependent disruption, and determining the likelihood for the models only varying M ⋆  and F_MID ). The shaded region/contour lines denote the logarithm of the likelihood of the model for the combination of M ⋆  and F_MID , and the filled (white) points denote the maximum likelihood models. Top: the analysis carried out on the unbinned dataset. Bottom: the same analysis, but now carried out on the binned dataset (four bins, each with the mean age/flux of three clusters). The white points from the upper panel denote models that are shown in Fig. 4.