Left panel: result of the χ2 minimization procedure of fitting the parameter 2 + n. Right panel: the clustering evolution model (black curve), corresponding to the best fit value (n = 3.03) for Mh = 1.3 × 1013M⊙, overplotting the literature x0 data in the hard and total band. Our direct estimate (not used in the χ2 minimization procedure) is shown as the filled circle. As a manifestation of the degeneracy discussed in Sect. 2, we show the expected clustering evolution for another (n,Mn) pair ≃ (2.0,2 × 1012M⊙) which is consistent with the data (red curve).
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