Comparison between z_spec and z_phot, for spectroscopic galaxies (and stars) with [3.6] < 25 (empty circles). Only robust spectroscopic measurements (CL > 95%) are plotted, and coloured according to their survey: zCOSMOS faint (Lilly et al., in prep.), VUDS (Le Fèvre et al. 2015), FMOS-COSMOS (Silverman et al. 2015), a survey with the FORS2 spectrograph at VLT (Comparat et al. 2015), a survey with DEIMOS at Keck II (Capak et al., in prep.), and grism spectroscopy from HST/WFC3 (Krogager et al. 2014). In the background we also show the comparison between z_spec and the original photometric redshifts of L16 (grey crosses). Upper panel: in addition to z_phot versus z_spec, in the bottom-left corner we report the number of objects considered in this test (N_gal), the σ_z error defined as the NMAD, and the fraction of catastrophic outliers (η). The dashed line is the z_phot = z_spec reference. Lower panel: scatter of the z_phot−z_spec values, with the same colour-code as in the upper panel. Horizontal lines mark differences (weighed by 1 + z_spec) equal to ±0.05 (dotted lines) or null (dashed line).