Modulation of infall orientations and quiescent fraction of young satellites at the time of infall. Left: distribution of the orientation of the progenitors of satellites in the young population at the first infall with respect to the major axis of the central galaxy (at z ∼ 0). The solid line shows a fit to Eq. (3). Right: modulation of the fraction of quiescent satellites progenitors of the young population at first infall time (similar to Fig. 3). The marginal distributions of the fitting parameters are shown in Fig. D.4.