Fig. 2. Values for the different parameters of precision of thermoregulation with exposures to different levels of oxygen. Upper and lower escape ambient temperatures (UET_a and LET_a, respectively), high and low limits of the T_b range (HT_bL and LT_bL) and preferred T_b are plotted as the mean of the 7.5 h median values of 12 lizards (P. vitticeps) ±s.e.m. (for visual clarity) instead of s.d. Values for s.d. are reported in Table 1. Animals were tested for 7.5 h in an electronic shuttle box at each of the experimental conditions. ^*Significant effect compared with normoxic values with the Holm–Sidak post-hoc test (P<0.05).