Fig. 4. The magnitudes (means ± S.E.M., N=60-80) of U and W wake flows, and the magnitude and direction (relative to the x-axis) of V flows as a function of individual (A). Ratio of U/total wake flow as a function of individual (B). Symbols represent means ± S.E.M. (error bars are smaller than the symbols), N=60-80. Freestream flow has been subtracted from U. U, V and W are flow velocities in the downstream (x), vertical (y) and lateral (z) directions, respectively.