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Effect of quality control on percentage data coverage. The various quality control steps have been applied sequentially as they are listed in the legend. Quality control based on absolute concentration and flux limits has been summarised as “hard flags”, the stationarity, integral turbulence and footprint tests as “soft flags”, γ refers to the third angle of the 3D coordinate rotation (Kaimal and Finnigan, 1994). Refer to the text for further details.
