Azimuthal velocity fluctuation levels, σ_vθ/⟨v_θ⟩, near the ring gap for the QK(q = 1.9) profile at Re = 5 × 10⁵ shown in Fig. 7. The radial locations of the scans are diagrammed in Fig. 4. Triangles are the QK(q = 1.9) profile. Shown for comparison are the solid body levels, dotted lines and one axial location for a QK(Ekman) profile, squares. Note that in the r = 123 mm panel, the solidbody line nearly overlaps the left plot border.