Variation in the photo-z vs. spec-z distribution parameters as a function of spec-z, for the 4-band KiDS-450 dataset with two different priors (grey lines), and as a function of NIR photometric information for the KV450 dataset (coloured lines). The three panels show the spread in the distribution, determined by a running normalised-median-absolute-deviation from the median (σ_m; top), the median bias in the photo-z distribution (μ_Δz; middle), and the fraction of sources with |Δz|/(1 + z_spec) > 0.15 (ζ_0.15; bottom). The addition of the Raichoor et al. (2014) prior to the 4-band data causes significantly better behaviour at low z_B, while the addition of NIR data improves the population consistency and scatter in particular at high z_B. The same properties as a function of photo-z and magnitude are given in Figs. 9 and 10.