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Fig. 7. Normalized total circulation in each phase of the wingbeat, where phase 5
at the right of the abscissa is the beginning of the downstroke and phase 1 at
the left marks the end of the upstroke: (A) inner wing (X in
Fig. 2), (B) mid-hand (Y in
Fig. 2), (C) outer-hand (Z in
Fig. 2) and (D) directly behind
the body (LR in Fig. 2). Error
bars represent ±s.e.m.