Fraction ϵ of the wind captured by the secondary (accretion efficiency) as a function of the ratio η of the terminal wind speed to the orbital speed for a dust condensation radius filling factor of 5% (upper panel) and 80% (lower panel). Square (resp. circular) markers are for C-rich (resp. O-rich) AGB stars. Blue (resp. orange) markers are for mass ratios of q = 1 (resp. q = 10). The results for O-rich stars are connected with solid lines and the error bars represent the variations over a dynamical time scale. The top scale is the same as in Fig. 4.