Fig. 9

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Surface plot of coherence data Γu(η, St) illustrating the nomenclature and methodology for the estimation of Stp and its bounding. Dashed line: integral coherence length ΛI at a given Strouhal number; blue line and panels: ηlim, limit of quadrature evaluation indicated by the vertical grayed areas; filled triangle (▲): peak of coherence length at Stp; open triangles (△): maxima of coherence at a given lag; thick grey lines: Strouhal number uncertainty range around Stp; filled circles (•): lags below ηmax = ΛI used for model fit at Stm; open circles (○): η > ηmax. Data for the circular cylinder flow at Re = 20,000.
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