Application of a theoretical S/N pre-selection to the halo catalogue. Left: weak-lensing selection function for clusters of galaxies, in the redshift–mass plane. The selection function has been computed assuming a Euclid-like redshift distribution with n_g = 30 gal.arcmin⁻² and σ_ϵ = 0.26. Contours denote the theoretical S/N for an NFW profile. Right: example of halo catalogue pre-selection using the theoretical S/N, for one 5° ×5° field. The light blue dots correspond to all the haloes in the field, and the dark blue dots are the selected haloes with S/N > 2.