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Fig. 7. Sequence of vorticity distribution in the wake at 65% wing length during single wing flapping (upper rows, A–L) and flapping two wings (M–X) using clap-and-fling wing beat pattern in the robotic wing. White boxes in the images show the region in which leading edge vorticity has been measured within the fluid. Vorticity is plotted according to the pseudo color code and arrows indicate the magnitude of fluid velocity; longer arrows signifying larger velocities. See Fig. 5 for temporal spacing between the images and more details. Values in the images are fractions of the stroke cycle (0–1).





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