Comparison between photometric and spectroscopic redshifts for sources within (left panels) and outside (right panels) the inAllLS10 area. In the top panel, the lines represent the one-to-one relation and the thresholds adopted to define outliers (see text and footnotes). The bottom panel shows the normalised residuals (z_phot − z_spec)/(1 + z_spec). The red lines in the lower panels indicate the moving medians and the 1 sigma region, revealing a negative bias above redshift 2. See main text for more details.