Cumulative size-frequency distributions N(>D) of the fragments produced in the simulation where the parent object was a single asteroid (top) and a binary system (bottom). The observed Hobson-family data are shown with a blue line (assuming geometric albedo p_V = 0.2 as in Fig. 3). A slight shift in the populations of kilometer-size and smaller fragments may be partly explained by the incompleteness of the observed family.