Kalliroscope image of three flows at Re ≈ 5 × 10⁵. A) centrifugally unstable flow with  [Ω₁,Ω₃,Ω₄,Ω₁] = [41.8,0,0,0]  rad/s. B) A quasi-Keplerian flow using the Ekman configuration, QK(Ekman),  [Ω₁,Ω₃,Ω₄,Ω₁] =   [41.8,5.6,5.6,5.6]  rad/s. C) A quasi-Keplerian profile with end ring speeds optimized to produce the best approximation to the ideal Couette flow 5, QK(q = 1.9),  [Ω₁,Ω₃,Ω₄, Ω₁] = [41.8,15.3,4.2,5.6]  rad/s.