Redshift distribution of the S₂₄ > 80 μJy a), S₂₄ > 300 μJy b), S₂₅₀ > 40 mJy c), S₃₅₀ > 30 mJy d), S₅₀₀ > 20 mJy e), S₈₅₀ > 3 mJy f), and S₁₁₀₀ > 3 mJy g) sources. These measurements are not fitted. Black solid line: our best-fit model. Black dotted line: 1-σ range of the model. Grey solid line: our best-fit model convolved by a Gaussian of σ_z = 0.125z. Purple three dot-dashed line: Le Borgne et al. (2009) model. Green dashed line: Valiante et al. (2009) model. Red asterisks: Le Floc’h et al. (2009)a), b), Chapin et al. (2011)c)–e), Chapman et al. (2005)f) and Chapin et al. (2009)g) measurements. Blue diamonds: Rodighiero et al. (2010) measurements a), b). Cyan squares: Desai et al. (2008) measurements b).