Contribution of various resonances to the eccentricity evolution ė_p / e_p as a function of e_p, for the run ℳ₂₀₀ and during the episode of e_p amplification at t ∈ [206–248] orbits. The semi-analytical decomposition focuses on the principal Lindblad resonances (LR0, yellow +), the first-order corotation resonances (CR1, green ×), the first-order coorbital (LR1c, light blue ◊), and external (LR1e, dark blue ★) Lindblad resonances. The sum of all these contributions are represented with red ◦. The rainbow curve represents a numerical measure of ė_p/e_p between t = 206 orbits (purple color) and t = 248 orbits (red color). Eccentricity growth is a finite-amplitude instability, with a damping of e_p when e_p < 1% or e_p ≳ 7%, and an excitation of e_p when e_p ∈ [1.5% – 7%].