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(Colour online) (a) Kolmogorov length scale η for NS550 (– – –) and R550 (O), and integral length scale Lε for NS550 (——), R550 (□), R950 (◇) and R2000 (Δ). (b) ℇl as a function of Reτ. Closed and open symbols are for wall-bounded and Robin-bounded cases, respectively. The dashed line is .
