JEB -- Park et al. 204 (15): 2741 Figure IG1

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Fig.1. Wingbeat frequency showed a significant curvilinear relationship (quadratic function) with air speed for both bird 1 (A) and bird 2 (B) (General Linear Model, GLM; bird 1: F_1,8=126.88, P<0.0001; bird 2: F_1,8=84.83, P<0.0001). The equations for the fitted curves are given in Table2. The proportion of variance (r²) explained by the statistical model was extremely high for both birds (96.9% and 96.1%, respectively). Values are means ± S.E.M. (N=5 flight sequences).