Liu–Qi² — ẋ=a(y−x), ẏ=40 x−xz+0.15 y, ż=xy−2.5 z+0.2 x. Classic a=10. +0.15y β=2.5+0.2x fold. Distinct from liu-zhou.html / qi-li.html. RK4. Gold trail, cap 650. RM = settled silhouette, no animate-on.