Halo exclusion: ratio between the measured cluster power spectrum described in Sect. 2.3 and the expected linear cluster power spectrum b²(L)P_mat(k), for clusters in four different bins of X-ray luminosity characterized by a luminosity L_i, with L₃ > L₂ > L₁. The luminosity bias b²(L) is that measured from the simulations. The shaded regions and the solid line represent the standard deviation and the mean, respectively, obtained from the N-body simulations.