First 1 Myr evolution of a and e, and the absolute values of t_a, t_e and t_i for an inner planet (left panels) initially located at a = 0.016 au with e = 0.1 and an outer planet (right panels) initially located at a = 0.1 au and e = 0.5. The planet masses are M_P = M_Mars. Solid lines indicate the results following the prescriptions from IDA20, and dotted lines show the corresponding results from CN08. The vertical lines indicate the moment at which e = h_g, which separates the subsonic (e < h_g) and the supersonic (e > h_g) regimes.