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Fig. 5. Reserve capacity in wingbeat frequency (fres; filled symbols) and in stroke amplitude ({Phi}res; open symbols) vs body mass (Mb) for hovering Xylocopa varipuncta females. Model II regression: fres=17.93–18.94Mb, r26=–0.73, P<0.001 (solid line); {Phi}res=50.44–39.35Mb, r28=–0.78, P<0.001 (broken line).