Fig. 4. (A) T_subcut and T_globe (means ± s.d.) from 2 animals in July over 24 h with means derived from 12 temperatures per hour, showing coincident changes during the day (pink) and the separation of temperatures at night (black). (B) In the mornings and evenings the difference between carotid and subcutaneous temperatures increases suggesting vasoconstriction, but narrows at midday suggesting vasodilation.