Proper semimajor axis a_p vs. proper eccentricity e_p for 100 synthetic families created in the main belt. It is the initial state, shortly after disruption events. We assume the SFD of bodies in each synthetic family similar to that of the Koronis family (down to D ≃ 2 km). Break-ups with the true anomaly f ≃ 0to30° and 150°to180° are more easily visible on this plot, even though the choice of both f and the argument of perihelion ϖ was random for all families.