Same as Fig. 12, but for η Corvi, with its required scattering rate of  ~10^-6 M_⊕ / yr. The scaling factor this time is , to account for the difference in stellar mass and radius of the outer belt. η Corvi is plotted by the cross, at its age of 1.4 ± 0.3 Gyr and with an outer belt mass of  ~20 M_⊕ (Wyatt et al. 2005). Again, no error bars are quoted on the mass of the outer belt, but its model dependence should be noted.