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Fig. 4. Minimum values of metabolic rate (MR) measured during the night. (A) Minimum MR was negatively related to chaff/seed ratio (F1,84=16.1, P<0.001) and temperature (F1,84=1278, P<0.001) and positively to their interaction (F1,84=5.28, P=0.024) and body mass (F1,84=8.69, P<0.005). BMR (values at 32°C; Calder, 1964) was not related to chaff/seed ratio (F1,23=0.26, P=0.62). The plotted data are not corrected for body mass. (B) Minimum values of mass-specific metabolic rates. Mass-specific MR was negatively related to chaff/seed ratio (F1,85=12.9, P<0.001) and temperature (F1,85=1253, P<0.001) and positively with their interaction (F1,85=4.24, P=0.043). Mass-specific BMR was not related to chaff/seed ratio (F1,23=0.02, P=0.89).