Comparison of electron temperatures t_e(O iii) (t_e = 10^-4   T_e) obtained from [O iii]λ4363/(λ4959 + λ5007) and t_e(S ii) obtained from [S ii]λ4068/(λ6717 + λ6730) emission-line ratios. Symbols are the same as in Fig. 7. Regression lines for all data are represented by purple lines. Regression lines for the UVES-only data are shown by black lines. (A color version of this figure is available in the online journal.)