Predicted 1- and 2-σ contours on the wCDM cosmological parameters, for Euclid, for different values of σ₈. All other parameter values are fixed to those shown in Table 1. Confidence regions and biases for σ₈ = 0.716 (bottom left), and σ₈ = 0.916 (top right) are shown. The additional IA-enhanced lensing bias is not included in these results. For the lower value of σ₈, the biases are supressed slightly, but still remain significant. However, for the higher value of σ₈, the significances of the biases in the cosmological parameters are heightened.