Comparison between the spectroscopic redshifts of confirmed clusters within the XXL-N/VIDEO overlap and the corresponding photometric overdensities in the VIDEO catalogue. The error bars correspond to the standard deviation of the Gaussian model that fits the photometric spike best. All clusters, except two (not included), were detected in optical. The green dots are the clusters that are a part of our sample, while the blue squares are not included in our sample since they do not meet our X-ray selection criteria. The magenta diamond is the newly confirmed candidate 3. The dashed line represents the ideal case, where z_phot = z_spec.