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(Colour online) Wall-parallel (x1–x3) correlations of the (a) streamwise, (b) wall-normal and (c) spanwise velocity for R550 (——), R950 (– – –), R2000 (– - – -) and R550-l1 (⋯ ⋯). Contours are 0.05 and 0.5 of the maximum value. The mean flow is from left to right.
