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Fig. 2. Experimental apparatus. (A) Fish swam in a multi-speed flow tank. Three
high-speed digital cameras captured synchronous dorsal, ventral and lateral
views of swimming fish. (B) Fin ray digitizing. Four points along every other
fin ray, represented here as yellow (x) symbols and lines, were digitized in
three dimensions using two simultaneous views (only the lateral view is shown
here) to calculate fin area and fin ray curvature. Yellow dots represent the
trailing edge of each fin as well as the body point that were digitized to
calculate excursion and phase lag.
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