Differential effective temperatures (T_eff, upper panel) and equatorial surface gravities (corrected for centrifugal force, log g_c, lower panel), between those from RA17 and this study. Colours indicated in the legend distinguish between AAA- and BBB-rated spectra and those with peculiar He II λ4686 (see text for details). Rapid rotators are highlighted with a large circle. Weighted mean and zero differences are shown by the dotted and dashed lines, respectively.