Portion of the normalized torque responsible for the change in the semimajor axis as a function of the density ratio at the 1:2 and 1:3 resonances Σ_1:2/Σ_1:3. Different colors indicate different disk aspect ratios at 5 au, as indicated in the legend. Markers indicate the state of each simulation at t = 10 t_ν. The lines show the evolution of each simulation, whose start is shown by the circles. The inset shows the evolution track for the simulation M-m1-h05. The high (low) line opacity corresponds to the lower (higher) disk mass regimes.