Completeness (fraction of objects for which the photometric redshift is inside a given slice around the true redshift) of different galaxy selection methods as a function of spectroscopic redshift and magnitude in the i′ band, for selections at a 1σ (68%) level. In red/blue, the selection methods lead to over-/underestimate the number of objects. From top to bottom and left to right, the objects are selected using the PDZ errors (ZPDF method), constant dispersions corresponding to σ_1∕(1+z) = 0.04 for i′ < 22.5 and σ_1∕(1+z) = 0.08 for i′ > 22.5 (cte method), a dispersion computed as a z_spec function (zfct method), and a dispersion computed as a (z_spec, i′mag) function (zmfct method, used in the rest of the study, see Fig. 5). The completeness is computed if there are at least 50 objects in the cell.