Values of “clustering similarity”, (top four figures), and confidence contours (bottom four figures) for all (n_s,δ) obtained with the analysis of four data sets with different assumptions, each is a typical realization of the reference model  = (n_s = 10^-4.8Mpc^-3, δ = 10°) indicated by a black cross. Rightwards and downwards, the number of events and energy threshold in EeV are: (N,E_min) = (50,60);(250,60);(50,80);(250,80). The source distribution follows the galaxies and the acceptance mimics the coverage of the Pierre Auger Observatory.