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Fig. 6. Velocity vectors from an asynchronous kick based on a ventral view
(horizontal light sheet; xz plane) showing the buildup and shedding
of the vortex ring generated by the foot. The reference vector equals 1 m
s–1. The four images are separated by 0.04 s. Velocity
vectors overlying the foot represent foot movement and illustrate the velocity
of the foot relative to the surrounding fluid. Free-stream flow velocity has
been subtracted from each vector.
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