MEGNO indicator for each simulation with differing initial embryo spacing (Δ₀), colored by the fraction of embryos that remained after 30 Myr. Circles represent “chaotic” simulations in which at least 20% of initial bodies experienced a collision, and triangles represent “quiescent” simulations. The dashed lines at MEGNO = 5.36 and Δ₀ = 10.8 mark the classifier cuts from the trained decision tree.