Dependence of the post-AGB maximum temperatures T_max and envelope masses on the core mass, based on the relations in Sect. 3.4. The solid lines show the parametrization, which are fitted to the Blöcker models. The short-dashed lines show the result of reducing the envelope masses at the end of the transition phase by a factor of three. In the bottom panel, we show the envelope mass at the start of the post-AGB evolution and at the time of maximum stellar temperature.