Models, scaled models, and empirical values of fast winds of PNe: a) the mass-loss rate Ṁ; b) the outflow velocity v; and c) the mechanical wind luminosity L_wind. Scaled values of Ṁ are illustrated with both magenta () and blue () star symbols. All symbols are indicated with both object (Table 4) and gray interconnecting lines for easy identification. Thick and thin lines indicate models based on Pauldrach et al. (1988) and actually used relations, respectively. The shaded part where T_eff ≥ 60 000 K indicates regions where both the models and the used relations fit empirical values poorly.