Histograms of the number of sources as a function of H_E for the Int Wide, SED Wide, EURISKO, and SPRITZ mock Euclid catalogues (top), or the number of sources as a function of redshift (bottom). For consistency with the test cases described in Sect. 3, we include only sources that have a ≥3 σ detection in the Y_E, J_E, and H_E filters. The histogram for COSMOS 2015 (Case 0; not shown) is similar to those of the Int Wide and SED Wide catalogues.