Comparison between and preliminary temperatures from the literature () compiled in Table 1 as function of the atmospheric parameters. The size of the symbols is inversely proportional to log ɡ in Table 2. The symbols distinguish the method with which was derived: Grey circles show colour–T_eff relations of Alonso et al. (1996), black contour circles show spectral fitting, and blue circles show excitation and ionisation equilibrium of Fe lines. The grey dashed, black dotted, and blue lines represent the mean offsets of the scales of –93, –122, and –105 K, respectively. Error bars are 1σ dispersions and correspond to symbol colours: 72, 86, and 169 K, respectively. The bottom panel includes labels with the names of the stars with discrepancies higher than 150 k.