Fig. B.1.

Fisher matrix vs MCMC forecasts, for Euclid WL only with ℓmax = 1500. In red, one-dimensional marginalised posterior distributions, with two-dimensional 68% and 95% confidence level marginalised contours, for varying cosmological parameters and fixed DE and IA parameters. Black curves represent the corresponding Fisher ellipses, from the validated Fisher matrix of EC19.
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