⟨v_θ⟩ for three different centrifugally stable profiles at Re = 5 × 10⁵. The dashed line is the ideal Couette profile based on the cylinder speeds, Ω₁ = 42.0,Ω₂ = 5.6 rad/s. The dotted lines are cubic spline fits to the bulk flow. The innermost velocity measurement overlaps the inner cylinder and is therefore not included in the interpolation. Both the systematic and random errors in ⟨v_θ⟩ are smaller than the marker size.