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Fig. 4. Optimal vortex formation during fast-swimming of N. bachei. Image
from dye flow visualization showing vortex formation in the wake of the
animal. Image height is 7.2 mm. No trailing flow exists directly behind the
vortex (see also movie in supplementary material), supporting the conclusion
that the animal generates a single vortex (shown schematically in inset) per
swimming cycle, despite the fact that
T*max
8.