Left: the fraction of systems that would be detectable with Spitzer (F/F_star(70   μm) ≥ 0.55 after 1 Gyr) as a function of the total mass in surviving terrestrial planets for cases A (black) and B (grey). This represents a horizontal slice through Fig 18. Right: the fraction of systems with 0.5   M_⊕ or more in terrestrial planets as a function of F/F_star(70   μm) ≥ 0.55 (1 Gyr) for cases A and B. Systems with F/F_star < 10^-2 are included in the bin at F/F_star ≈ 10^-2. The Spitzer detection limit is shown as the dashed line. This represents a vertical slice through Fig. 19.