From top to bottom: detection completeness and difference between output and input β and M₁₆₀₀ from our ERS (left) and HUDF (right) mock catalogues. All quantities are computed for objects in three observed magnitude bins centred at: H = 24.5 (ERS) and H = 25.5 (HUDF) (black continuous lines and filled squares); H = 25.25 (ERS) and H = 26.3 (HUDF) (dashed blue lines and open squares); H = 26.0 (ERS) and H = 27.0 (HUDF) (red dot-dashed lines and crosses).