Results of the parameter study. Left column: total mass of captured planetesimals as a function of (a)-1: the migration timescale of the planet, τ_tid,0, (b)-1: the radius of planetesimals, R_pl, (c)-1: the initial semi-major axis of the planet a_p,int, and (d)-1: the mass of the planet M_p. Right column: fraction of planetesimals captured by the planet as a function of the source semi-major axis (the same as Fig. 4) for the different cases we consider as indicated in the legend. Cases shown with red (blue) plots in (d)-1 are shown with red (blue) lines in (d)-2.