Yu–Pan² — ẋ=a(y−x), ẏ=−xz+28 x−0.5 y, ż=xy−3z+0.25 x. Classic a=10. 28x−0.5y+0.25x fold. Distinct from yu-pan.html / pan-li.html. RK4. Gold trail, cap 650. RM = settled silhouette, no animate-on.