Top panel: the average number of photons associated to each clusters N_p, and their dispersion (vertical bar) vs. the number of photons simulated (N_p sim). The red points refer to the sub parameter space ε = 0.15 deg, and the solid blue circles to the ε = 0.20 deg subspace. The solid green lines represent the law N_p = N_p sim. The dashed lines represent the law N_p = N_p sim. ± 10. Bottom panel: the corresponding fractional deviation (N_p − N_psim.)/N_psim.