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Fig. 2. Plasma testosterone (T) concentrations (median ±0.5 interquartile intervals), widths of the cloacal protuberance (CP; id.) and body masses (mean ± S.D.) of adult male house finches as a function of time after the beginning of T administration on Day 0. *Indicates a significant difference (Student–Newman–Keuls test, P<0.05) between T-treated (filled circles; N=10) and control (open circles; N=10) males.