Sprott–Linz Case A — dx/dt = y, dy/dt = −x + y·z, dz/dt = a − y². Classic chaotic a≈0.5 (not the sprott.html a≈1 framing). RK4, 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.