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Fig. 4. Wake flow at three different swimming speeds and three different phases
during the tail beat cycle. Black arrows represent flow velocity magnitude and
direction. Vorticity is shown in color in the background, and contours of the
discriminant for complex eigenvalues at -200, -500 and -1000 are shown in
white. The eel's tail is in blue at the bottom. Note that the vector scale is
different for each swimming speed but the length and vorticity scales are the
same in all plots. Mean jet magnitude in L s-1 is written
beside each jet. Horizontal lines are provided to facilitate comparisons of
jet diameter.
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