Stellar-wind velocities (top) and mass-loss rates (bottom) versus stellar T_eff for the same post-AGB tracks and sample objects as in Fig. 7. The dash-dotted line in the top panel represents the wind velocity of the 0.595 M_⊙ model halved, the dashed line in the bottom panel the mass-loss rate of the 0.595 M_⊙ model increased by a factor of 200. The positions of the objects no. 6 (NGC 3242) and no. 8 (NGC 5315) nearly coincide in the top panel, and those of no. 5 (NGC 2392) and no. 10 (NGC 6826) in the bottom panel.