Mass completeness threshold ℳ_lim as a function of redshift, computed for the total sample (the one used in Sect. 3.2, filled circles) and for the red (upward triangles) and blue (downward triangles) populations, defined as discussed in Sect. 5. In each redshift bin, the ℳ_lim estimate relies on the rescaled stellar mass ℳ(i = i_lim) of the 20% faintest galaxies (see text). We show ℳ(i = i_lim) of the red and blue galaxies with small dots of analogous colours.