Simultaneous T_e[O II] and T_e[S III] measured in the CECILIA sample (red circles; 3σ T_e[S III] upper limits provided with black arrows), local EELGs (blue squares), and the metal-rich CHAOS H II regions (gray diamonds). We also include direct T_e from the AURORA (R. L. Sanders et al. 2025b) and MARTA surveys (E. Cataldi et al. 2025; M. Curti et al. 2025a) as purple and white triangles, respectively. The theoretical T_e scaling relation from D. R. Garnett (1992) is plotted in green, while the black dotted line indicates equivalent T_e[O II] and T_e[S III]. The histogram distributions of the 17 T_e[O II] and 9 T_e[S III] measurements in CECILIA are provided in the right and top panels, respectively. The high-z T_e are generally consistent with those measured in the local Universe and from photoionization model predictions, but there are currently insufficient data to assess the scatter in T_e[O II]–T_e[S III] at high z.