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Fig. 4. Respiratory system compliance (Crs) (A) and resistance (Rrs) (B) as a function of body mass (W) in newborn mammals [open symbols (Mortola, 2001); solid symbols, this study]. The exponents of the allometric equations for all newborns and for eutherians only are indicated. Values for tammar wallabies are means ±1 S.E.M. (day 1, N=7; day 6, N=6).