Comparison of the results of N-body simulations, squares, with those of analytical formulae of Eqs. (17) and (18), and with our predictions. Left snapshot: squares are the results of N-body simulations. The predictions of Eq. (17) are represented by the smooth solid line while the predictions of Eq. (18) for Γ = 1/3 and Γ = 1/2 are represented by the dashed lines (large dashes and small dashes respectively). Right snapshot: squares are the results of N-body simulations. The results of our Monte Carlo simulations are given by the solid line.