JEB -- Spedding et al. 211 (2): 215 Figure IG5

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Fig. 5. Normalised circulation, ${Gamma}$ , of the largest coherent wake structure in the wake of a thrush nightingale (TN, squares), two robins (RO, circles and triangles) a house martin (HM, diamonds), and a redstart (RED, shaded triangles) as a function of normalised flight speed (U/U_mp). The solid line is from Eqn 5. Data compiled from Rosén et al. (Rosén et al., 2007) and Hedenström et al. (Hedenström et al., 2006b).