Comparison of the semi-major axis evolution (black solid) of the planet with respect to the corotation (Γ_C, blue dotted), Lindblad (Γ_LB, blue dashed), and total torques (Γ_tot = Γ_C + Γ_LB, orange solid) in the primordial (left panels) and transition discs (right panels), calculated from FARGO. The torques were divided by Γ₀, which is the unperturbed torque at the planet location (cf. Eq. (10)).