Marginalised 2D constraints on the pair (b₁,α_P, 1) for the case corresponding to the Model 3 HOD sample at z = 1.2. The three different panels correspond to the case in which all the parameters are left free (left panel), $b_{{\mathcal{G}}_2}$ is fixed to the excursion-set relation as in Eq. (37) (middle panel), and b_Γ3 is fixed to the coevolution relation as in Eq. (36) (right panel). Different colours represent different k_max values, as listed in the legend. Fiducial 68% confidence intervals for both b₁ and α_P, 1 are shown with grey bands.