Photometric redshift z_phot (left), redshift error z_phot − z_spec (middle), and error divided by the estimation of the error provided by the method (z_phot − z_spec)/δ_zphot (right) as a function of the spectroscopic redshift z_spec. These results were obtained with a 100-fold cross-validation strategy on the set of galaxies with the five magnitudes available (𝒯₅). The black dots represent the individual galaxies. Only 10% of the galaxies are shown, for better visualisation. The red solid and dotted lines represent the median and the 68% confidence regions, respectively, computed for groups of 10 000 galaxies with consecutive z_spec. The orange line shows z_phot = z_spec.