Confidence contours (computed at 1σ and 2σ for two interesting parameters) on γ and normalization (referred to z = 0.6) for all the datasets analyzed in Sect. 5.1. Blue and cyan contours refer to our 0−0.6r₅₀₀ sample and our 0.15−0.6r₅₀₀ sample, respectively. The contours for MAU08 samples (computed excluding CLJ1415.1+3612, see text and Table 4) at r = 0−1r₅₀₀ and r = 0.15−1r₅₀₀ are plotted in red and pink, respectively. Green contours refer to the BLS07 sample, while orange contours are plotted for the Anderson et al. (2009) dataset.