Fig. 8.— The 2-D PDF of the disc mass M$_{d}$ versus the minimum Q , Q$_{min}$ , of the disc. Black refers to scenario K; green refers to scenario KL; red refers to scenario KG; blue refers to scenario E. The thick lines enclose the 1 σ confidence region, and the thin lines enclose the 2 σ confidence region. The blue-outlined stars correspond to the parameters of the models chosen to test stability, and the purple circles correspond to the points used by BG97 ( § 7.1). 42