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Fig. 5. Digitized silhouette and midlines of a trout (A) entraining and (B)
Kármán gaiting around a 5 cm D-section cylinder, along with
corresponding ventral view images, from top to bottom (100 ms apart). Flow is
from left to right at 2.5 L s–1, where L is
total body length. Note that during entraining the body axis is tilted at an
angle to the x axis. Midlines of entraining fish demonstrate the lack
of axial undulation, in contrast to the large amplitude body undulations seen
in Kármán gaiting fish.
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