Top panel: photometric vs. spectroscopic redshifts for the whole spectroscopic sample within the considered field (one point at z = 3.26 with photo-z = 3.44 is not plotted). The gray line traces the bisector. Gray symbols show uncertain spectroscopic redshifts (quality flag B or worse, see Rosati et al. 2009; these objects are plotted together with the secure redshifts in the lower panels). Middle panel: Δz/(1 + z) as a function of redshift for the spectroscopic sample at 1 < z < 2 (one catastrophic outlier with an (uncertain) redshift z = 1.06 and a photo-z = 1.64 falls out of the plot). The dotted line and the gray shaded area show the median and the 16th−84th percentile range of Δz/(1 + z). The hatched area shows the Δz/(1 + z) scatter as estimated by the NMAD estimator. Bottom panel: the spectroscopic (solid black line) and photometric (dashed line) redshift distribution of bright (H < 22.2) galaxies in the studied field. The gray histogram shows instead the photometric redshift distribution of all spectroscopic cluster members. Histograms are slightly offset for clarity.
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