Histograms of the redshift samples used in this work. For NetZ_main, we show the original redshift distribution in red, and the data augmented distribution in dashed black (with more galaxies at z_ref > 1) that was used for our final network. The distribution used to train our two specialized networks (see Sect. 6 for details) is overplotted for NetZ_lowz in blue and for NetZ_LRG in orange.