Left: the dust-to-stellar flux ratio at 1 Gyr at 70   μm vs. the total terrestrial planet mass for the widedisk (grey) and mixed (black) simulations. Filled circles represent stable simulations and open circles unstable ones. The solar system is shown with the grey star. Right: histogram of the fraction of systems that contain 0.5   M_⊕ or more in terrestrial planets as a function of F/F_star(70   μm) after 1 Gyr; this is essentially a vertical slice through the left panel.