Fig. 6
Time-averaged 
, normalised by urmsbrms, as a functionof z (solid black curve). The blue dash-dotted curve (very close to the black line) shows the same quantity but having removed low horizontal wavenumber components (k∕k1 ≤ 2) from the flow before calculating 
and 
. The red dashed curve shows the effects of removing more Fourier modes (k∕k1 ≤ 6).
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