Guckenheimer–Holmes 1983 — dx/dt=a x−b y+c z x+d z(x²+y²), dy/dt=a y+b x+c z y, dz/dt=e−z²−f(x²+y²)−a z³. Classic a=0.4. Distinct from arneodo.html, coullet.html. RK4. Gold trail, cap 650. RM = settled silhouette.