Position of a region with no predicted wind in the T_eff vs. log g diagram for two different metallicities (two shades of red regions). Overplotted are the evolutionary tracks of Dorman et al. (1993) and the positions of subdwarf stars with known mass-loss rates derived from observed UV wind-line profiles (blue circles) and X-ray emission (black crosses) – see Tables 2 and 3. Small black dots denote the positions of stars CD-30 11223 (1) and PG1232-136 (2).