One-dimensional posterior distributions, and 68% and 95% confidence level marginalised contours for the dark energy parameters (w₀ and w_a) and the parameters h and σ₈. The left panel refers to the ℓ_max = 1500 case, while the right panel uses measurements deeper into the non-linear regime, with ℓ_max = 5000. The mock data of Euclid cosmic shear assume Halofit+PKequal non-linear corrections as reference, while the parameter estimation is performed with either HMCode (blue), or Halofit (orange). Black dashed lines mark the fiducial model.