The already known variable and non-variable PG 1159 stars and variable (WCE) stars in the log T_eff − log g plane. Thin solid curves show the post-born again evolutionary tracks from Miller Bertolami & Althaus (2006) for different stellar masses. “N.V.D.” stands for PG 1159 stars with no variability data. “Hybrid” refers to PG 1159 stars exhibiting H in their atmospheres. The location of the two new GW Vir stars TIC 333432673 and TIC 095332541 is emphasized with a large red star symbol with error bars. Both stars share the same spectroscopic surface parameters, T_eff = 120 000 ± 10 000 K and log g = 7.5 ± 0.5.