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Fig. 5. (A,C,E) Relationship between body mass, wingbeat frequency and
mass-specific metabolic rate independent contrasts obtained from cyt
b phylogeny (Fig. 1), and
using gradual (filled circles, solid lines) and speciational (open circles,
broken lines) models of character evolution. (B,D,F) These relationships
(solid and broken lines) are superimposed on the distribution of correlation
coefficients resulting from analyses performed with 10 000 different trees
(see Materials and methods).