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(Colour online) (a) Wall-parallel premultiplied boundary-normal velocity spectra at for R550 (——), R550-l1 (O) and R550-l2 (●). Contours are 0.1 and 0.6 of the maximum. The red dashed line is λ3 = 0.7λ1. (b) Adaptation length la for the mean velocity profile (◇), and r.m.s. streamwise (O), boundary-normal (□) and spanwise (∇) velocity fluctuations as a function of the slip length l. Colours are black for R550, blue for R950 and red for R2000.
