Comparison of the SPY sample to evolutionary tracks in the T_eff – log g plane. Tracks for He-core WDs in blue (Panei et al. 2007), for C/O core WDs in black (Renedo et al. 2010) and for O/Ne core white dwarfs in red (Althaus et al. 2005). The tracks are labelled with their mass. Positions of all stars in Table C.2 excluding the DD white dwarfs and stars without a mass determination. Magnetic white dwarfs are shown in magenta, those with only one spectrum in Table B.1 in green. The hot, low gravity star HE 1106−0942, the high gravity DA WD 0346−011, and the magnetic, high gravity DA WD 2051−208 are off-scale.