Left panel: z_phot vs. z_spec for a set of galaxies with z_flag ≥ 2, showing the galaxies brighter/fainter than I_AB = 22.5 in black/gray. Right panel: histogram of (z_phot−z_spec) / (1 + z_spec) for the same set of galaxies and its Gaussian fit. The black/gray histogram refers to galaxies that are brighter/fainter than I_AB = 22.5, while the continuous/dotted red line shows the Gaussian fit to the histogram of the brighter/fainter galaxies. The labels indicate the value of σ for each Gaussian.