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Fig. 3. (A) Rate of oxygen consumption (O2) and (B) respiratory exchange ratio (RER) of ruff sandpipers at rest and during running at various speeds. The lines indicated were fitted by linear regression on the exercise values only (A: y=0.64x+54.07; B: y=0.01x+0.824). Values are means ± S.E.M.; sample sizes are indicated in parentheses. Significant differences from values at rest are shown; *P<0.05, {dagger}P<0.001.