Comparison of the results obtained in this work (crosses) with results from other investigations (for data and reference identifiers, see Table A.2). Upper 3  ×  3 panels: log g vs. T_eff; all panels have the same scale, corresponding to an extent of 5000 K in T_eff and 0.4 dex in log g. Lower 3  ×  3 panels: log Q vs. log (L/L_⊙), with axes extending over 0.4 dex in log (L/L_⊙) and 3.5 dex in log Q. In order to facilitate the comparison with ρ²-diagnostics, all Q values have been normalized to f_v = 1 (see Eq. (A.1)). The asterisks provide the Q_res-values which have to be compared with the corresponding values from ref# 1 (Fullerton et al. 2006, ρ-diagnostics, but including the product with the ionization fraction of Pv). Note that all Q_res values have been scaled by a factor of 10 to fit into the individual figures.