Top: dependence of β on the redshift. The red line represents the ensemble value β = −0.69. The value of β doesn’t show a clear trend with redshift, although some deviations are present for some bins. Bottom: redshift histogram of the sample. Up to z ≃ 2.8, the number of points in each bin is ≳ 10², while for z ≳ 2.8 the bins include much fewer points, and therefore the βs have greater errors.