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Fig. 10. Schematic summary of the results of the present study, showing the wake
behind a swimming eel at three different times. The size of the eel and
position of the vortices are scaled to represent the true spacing. Vortices
are indicated by blue and red arrows; primary vortices are solid lines and
secondary vortices are dotted lines. The lateral jets are shown as block
arrows, with lengths and angle proportional to the jet magnitude and
direction.