Fig. 2. The relationships between T_brain (red), T_carotid (blue) and T_jugular (brown) on the 6 hottest days of winter (A), the 6 days of intermediate temperature (B) and the 6 coldest days (C; see text). As days become colder the range of T_brain and T_carotid becomes narrower. On hot and intermediate days T_jugular and T_carotid diverge while on the coldest days T_carotid and T_jugular converge.