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Fig. 3. Standardised BMR residuals in relation to age (years) of snow petrels
(N=38, range 8–39 years old). The birds are of known age
because they were ringed as chicks. The residuals were obtained from the final
model in Table 2 (BMR
controlled for body mass and body condition). Standardised residuals are
divided by an estimate of their standard deviation (s.d.), and have mean=0 and
s.d.=1.