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(Colour online) Premultiplied streamwise ϕ11 (a,d), wall-normal ϕ22 (b,e) and spanwise ϕ33 (c,f) velocity two-dimensional spectra at x2 = 0.10h for NS550 (——), NS550-s1 (O) and NS550-s2 (●). The wavelengths are scaled by x2 in (a–c) and by l* in (d–f). Contours are 0.1 and 0.6 of the maximum.
