Left: photometric vs. spectroscopic redshifts for all galaxies in the 11 cluster fields. Outliers, defined as objects for which |Δz| > 0.15, are marked in orange. The outlier fraction is 4.1%, the scatter of the remaining objects is σ_z = 0.048. Right: Δz as a function of K_s-band magnitude, for sources with 1.0 < z_spec < 1.5. Quiescent and star-forming galaxies (separated according to the criteria given in Sect. 3.3) are marked in red and blue, respectively.