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Fig. 6 (A-L) Time sequence of the wake produced by a tandem dragonfly wing moving in a horizontal plane. In contrast to Fig. 5, the time sequence shows the wake while the hindwing leads wing motion by a quarter stroke cycle. Wing kinematics and experimental techniques are similar to those mentioned in the legend for Fig. 5. The vortex that is indicated by the broken yellow line in I appeared to break down in the video image or moved outside the image plane.





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