Lorenz-84 — dx/dt = −a·x − y² − z² + a·F, dy/dt = −y + x·y − b·x·z + G, dz/dt = −z + b·x·y + x·z. Classic chaotic a=0.25 b=4 F=8 G=1. RK4, not Sprott–Linz C (yz, x−y, α−x²), not Sprott–Linz B (ż=α−x·y), not Sprott–Linz A (y, −x+y·z, a−y²), not sprott.html, not classic Lorenz butterfly (σ ρ β), not Finance, not Bouali, not Genesio–Tesi, not Arnéodo–Coullet–Tresser, 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 Newton basins. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.