T_eff − log g diagram of the HW Virginis systems. The zero-age EHB and ZAEHB, and the terminal-age EHB and TAEHB are superimposed by evolutionary tracks by Dorman et al. (1993) for sdB masses of 0.471, 0.473, and 0.475 M_⊙ with one track for an extremely low-mass white dwarf of a mass of 0.2724 M_⊙ by Althaus et al. (2013). The newly found systems are shown as red circles with error bars. The published HW Vir systems are shown as green circles, the reflection effect systems without eclipses as yellow squares. The blue crosses represent other sdB binaries (Kupfer et al. 2015), either with white dwarf or unknown companions.