Histogram of the differences between the presently computed reliable photo-zs (galaxies in 19.5 ≤ F814W ≤ 24.5, at redshift lower than 1.5, and with 1σ LePhare uncertainty estimate lower than 0.2 × (1 + z)) and the HyperZ photo-zs of Pelló et al. (2009). The black histogram is for F814W ≤ 24.5 and the red histogram is for F814W ≤ 22.5. The inner figure is a magnification of the central peak.