Fig. 7. The predicted relative influence of the wind components (x_w and y_w, left and center respectively) on air speed (V_a) for each dataset (A) SRD (simulated random data; no relation between wind and flight) (B) SWI (simulated wind influence) (C) APM (autumn passerine migration). The form of each GAM is V_alo(x_w, 0.8, 2)+lo(y_w, 0.8, 2). The y-axis represents the contribution of x_w and y_w on V_a. The solid line is the fitted functional response and the broken lines represent the 2x standard error curves, the circles represent the partial deviance for each observation point. The local minima in Fig. 7B correspond with x_g (6 m s^-1) and y_g (3 m s^-1) in the SWI dataset. Figures on the far right represent the observed (y-axis) vs fitted V_a (m s^-1) (x-axis); note that the x and y axis are not always equally scaled.