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Fig. 9. The variation in normalized circulation over the five wingbeat phases for
the swift and for the thrush nightingale (TN) at two flight speeds,
U=7 and 10 m s–1, that describe medium- and
high-speed flight, respectively, in wind tunnel conditions. The swift data
come from Fig. 7A and the
thrush nightingale data from the database described in Spedding et al.
(Spedding et al., 2003b). The
data from both species come from the inner wing.