Comparison of the constraints using the mass functions of Watson et al. (black) and Tinker et al. (red), with b fixed to 0.8. When relaxing the constraints on the evolution of the scaling law with redshift (blue), the contours move along the degeneracy line. Allowing the bias to vary uniformly in the range [ 0.7,1.0 ] enlarges the constraints perpendicular to the σ₈–Ω_m degeneracy line due to the degeneracy of the number of clusters with the mass bias (purple). Contours are 95% confidence levels here.