Dependence of the timescales for orbital evolution obtained from numerical simulations. The shaded region is excluded due to gas dispersal after 10 Myr. Solid line indicates semimajor axis evolution timescale, ﹩{\tau }_{a}﹩(blue). Dashed lines indicate eccentricity evolution timescale, ﹩{\tau }_{e}﹩, for ﹩e=0.1﹩ (red) and ﹩e=0.3﹩ (green). Triangles indicate the inclination evolution timescale, ﹩{\tau }_{I}﹩, for a circular orbit with initial ﹩I=0.05﹩ rad. Note the logarithmic scales.