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Fig. 4.

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Projected 1σ and 2σ 2-parameter uncertainty contours for Euclid, with and without correcting for source-lens clustering, magnification bias, and source obscuration. These are predicted using the Fisher matrix formalism, for the w0waCDM cosmology specified in Table 3, in the case when ΩK = 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-orange contours. Significant biases are predicted for Ωm, Ωb, ns, σ8, w0, and wa, and their values can be found in Table 6.

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