Histograms of M₁₅₀₀ for our parent samples at z ≈ 3.7 (= 2.91–4.44, left), 5.0 (= 4.44–5.58, middle), and 5.9 (= 5.58–6.12, right). Upper panels: magenta histograms and black dashed lines represent the number distribution of our parent sample and that expected from the UV luminosity functions (UVLF) in Bouwens et al. (2015b) for the same effective survey area, respectively. The uncertainty of the number distribution of our parent sample is given by the Poisson error. Grey hashed areas indicate M₁₅₀₀ ranges that are not used in this work. Lower panels: light-grey histograms shows the number distribution in Stark et al. (2010) at z ≈ 3.75, z ≈ 5.0 and z ≈ 6.0. Dark-grey dashed and dotted lines indicate the M₁₅₀₀ for 90% completeness at z ≈ 4, 5, and 6 in Arrabal Haro et al. (2018) and the magnitude cut at z ≈ 6 in De Barros et al. (2017), respectively.