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Fig. 4. (A-H) Vorticity plots at half-wing length at various times during one cycle
(advance ratio J=0). 
, non-dimensional time; c,
non-dimensional period of one cycle; 
, angle of attack of wing. Solid
and broken lines indicate positive and negative vorticity, respectively. The
magnitude of the non-dimensional vorticity at the outer contour is 1 and the
contour interval is 1. (A-D), downstroke; (E-H), upstroke.
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