Red sequence photometric redshift performance. Spectroscopic redshift vs. photometric redshift from the colour of the red sequence in g − r (small open points, error bars are not plotted to avoid crowding, there are 228 plotted points, sometime one on top of the other) or R − z′ (solid points with error bars). The z_phot = z_spec line and the z_phot = z_spec ± 0.02 loci are indicated with solid lines.