Performance of the photometric redshift estimate: contours indicate the density of objects at each location. In this figure only, we consider that the photometric redshift estimate fails when z_spec does not belong to the 3σ confidence interval of z_mp (light magenta). Upper panel: z_spec vs. z_mp when offsets are applied. Middle panel: residuals Δ = (z_spec − z_mp)/(1 + z_mp) vs. z_mp when offsets are applied. The light blue line is a linear fit to the three points in light blue, representing the median values when the data are binned in three bins. We observe that z_spec ≳ 1 galaxies tend to have their z_mp value underestimated (cf. light blue line). Lower panel: residuals Δ vs. z_mp when no offsets are applied.