Predicted 1- and 2-σ contours on the wCDM cosmological parameters, for Euclid, for different values of n_s. All other parameter values are fixed to those shown in Table 1. Confidence regions and biases for n_s = 0.86 (bottom left), and n_s = 1.06 (top right) are shown. The additional IA-enhanced lensing bias is not included in these results. In general, varying the fiducial value of n_s does not cause notable change to the significances of the biases.