One-dimensional posterior distributions, and 68% and 95% marginalised joint two-parameter contours for w₀ and w_a, and the parameters h, n_s and σ₈ from the MCMC analysis. The results are obtained by neglecting baryon effects when fitting mock datasets created without baryonic effects (green) and with baryonic effects (orange for CH18, blue for ST15 and purple for Hd15). The left panel refers to the ℓ_max = 1500 case, while the right panel goes deeper into the non-linear regime, with ℓ_max = 5000.