Arnéodo–Coullet–Tresser — dx/dt = y, dy/dt = z, dz/dt = −α·x − β·y − z + μ·x³. Classic chaotic α=5.5 β=3.5 μ=−1. RK4, not Sprott–Linz A, not sprott.html, not Newton–Leipnik, not Rabinovich–Fabrikant, not Nosé–Hoover, not Rucklidge, not Wang–Sun, not Lü, not Chen, not four-wing Qi, not Dadras, not Halvorsen, not Chua, not Aizawa, not Thomas, not Rössler, not Lorenz butterfly, not Newton basins. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.