T_eff versus log g as calculated from the 22 335 BHB candidate objects where an SED calculation was made (yellow dots); 10 604 SEDs where the full frequency range is available (cyan dots), of which 9172 (magenta dots) lie within the horizontal-branch region as marked by the green lines defined by Eq. (6) and (7) (upper panel). The BaSTI ZAHB (blue line) and TAHB (black line) are also shown. Middle panel: T_eff versus R. Lower panel: T_eff versus L for the same subsets.