Projected 1σ and 2σ 2-parameter uncertainty contours for Euclid under a ΛCDM cosmology, with and without correcting for the source-lens clustering, magnification bias, source obscuration, and local Universe terms. These are predicted using the Fisher matrix formalism, using the cosmology specified in Table 3, in the case where Ω_K = 0 and is kept fixed. The true location of the constraints is denoted by the blue-dashed contours, while the biased locations if the corrections are not made are given by the solid-gold contours. Significant biases are predicted for Ω_m, Ω_b, h, and σ₈, and their values can be found in Table 5