Comparison of the fundamental temperature values with mean values of spectroscopic and photometric determinations compiled from the literature. The stars are ordered by increasing fundamental temperature from left to right. The two upper panels display the difference in the literature T_eff from the fundamental T_eff. Black error bars centred on zero represent the uncertainty in fundamental T_eff for each star, while grey error bars represent the standard deviation of the mean for N ≥ 3, and combined and individual uncertainties in the case of two and one determinations, respectively. The number of determinations for each star are indicated in the two panels. The bottom panel compares the photometric and spectroscopic temperature measurements with error bars representing combined standard deviations. Symbol colour indicates metallicity from Table 1. See text and Table 11 for data, references, and discussion.