Analysis results for the complete DQ sample. Top panel: log g as a function of T_eff for DQ (black crosses), wDQ (red xses), and hDQ (blue squares). The large red circle is the average result for peculiar DQ as explained in Sect. 6. Bottom panel: [C/He] abundance ratios, with the same symbols as in the top panel, except for the two red asterisks, which are warm DQ with individually determined lower limit on [C/He]. The [C/He] for the hot DQ were held fixed and are typical lower limits.