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Fig. 3. Temperature differential between surface Ts and ambient temperature Ta ({Delta}Ts—a) as a function of Ta for eyes (filled circles), nose (filled squares), ears (filled triangles), feet (filled diamonds) and flank (open circles) in normoxia (A) and after 15 min of hypoxia (B). A linear relationship between {Delta}Ts—a and Ta implies minimal specific thermoregulatory adjustments in Ts, whereas a departure from linearity at a given Ta implies thermoregulatory adjustments at that surface to either increase or decrease heat loss.