Mass cutoff used to select the galaxy population for the construction of the formation redshift function (FzF). The grey crosses represent the full VUDS sample, while the orange circles are the galaxies selected for the computation of the FzF. These galaxies are selected to be above the blue line. The blue line represents the evolution of a galaxy with log M_⋆ = 9.3 at z = 5 with redshift, following the evolution of the characteristic mass of the stellar mass function as derived by Ilbert et al. (2013).