Top panel: time evolution of the inner binary eccentricity in the simulated triple BIN1-374. At ∼460 yr, the binary–binary scattering drives the formation of a triple arranged in a hierarchical configuration, while the fourth object is ejected away. KL oscillations are apparent after the formation of the triple system. Bottom panel: same as above, but for model BIN2-152. In this case, the rapid variations are due to the chaotic interaction with the outer perturber, itself attributable to the formation of a non-hierarchical triple. In both cases, colour-coding marks the mutual inclination.