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Streamwise (circles and – – –), wall-normal (triangles and – – –) and spanwise (squares and ⋯ ⋯) r.m.s. velocity fluctuations scaled with u*. Symbols are for NS550-p (open) and NS550-n (closed). Lines without symbols are for NS550. For clarity, the profiles for the wall-normal and spanwise r.m.s. velocity fluctuations are shifted vertically by 2.0 and 3.4 wall units.
