Radial profiles of characteristic velocity v_c (a) and planetesimal size d_c (b) for different disk models, in which we vary disk eccentricity e₀, surface density normalization Σ₀, and apsidal angle ϖ_d (one parameter at a time relative to the fiducial model described in Sect. 5 and shown with the thick black curve), as indicated in the legend. See the text for more details on various features of these curves.