Comparison of the final orbital parameters obtained in our simulations with observed post-AGB orbital elements (red diamonds; see Sect. 4.1 for references of the data). Each panel corresponds to a different model. Green squares correspond to the orbits of the simulated systems at the end of the AGB phase. During the subsequent post-AGB phase, the CB disk continues to act until its dissipation, producing final orbits represented by yellow star symbols.