Best description of the RG star HE 2144−1832 (top panel) and post-AGB star J004441 (bottom panel) using the AGB models computed in this work (Table 2). The three best models are shown in black (lowest ), grey (second lowest ) and light grey (third lowest ). The dilution factor f_dil (Eq. (5), fixed to zero for post-AGB stars) and smallest value are indicated. The comparisons for the other stars are shown in Fig. A.1.