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Fig. 3. Relationship between log body mass (m) and either log stroke amplitude ({Phi} filled circles) or log wing-beat frequency (n; open circles) for eleven species of orchid bees. Linear regressions as follows: log{Phi}=2.17–0.005logm, r2=0.35, P=0.055 (NS); log n=2.94–0.13logm, r2=0.90, P<0.001. NS, not significant.