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As plasma cortisol levels (ng/ml) increase, EOD amplitude (mV) increases for the low and high competition males but not for the isolated males (low competition; day: y = 0.12x + 0.77 & night: y = 0.15x + 0.70 and high competition; day: y = 0.09x − 1.44 & night: y = 0.11x − 1.52). EOD τP2 and cortisol were not related in our dataset.
