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Fig. 5. Mean axial flow as a function of wing beat frequency. The anemometric time series from all bouts from Moth 5 (A), Moth 6 (B), Moth 7 (C), Moth 11 and Moth 12 (B) were divided into 1 s bins and the peak wing beat frequency for each bin was plotted against the mean value of the airflow over that bin. The grey area in the background describes the range of values predicted by Eqn 1.