Estimated mass-transfer rates onto the companion from the post-AGB star (solid red) and the circumbinary disk (dashed blue) vs. the jet mass-loss rates derived from the model for the objects in our sample (excluding RV Tau and SU Gem). The values are plotted on a logarithmic scale. The diagonal lines indicate the jet ejection efficiency (Ṁ_jet/Ṁ_accr). For instance a value of 0.1 indicates an ejection efficiency of 10%.