Cumulative and normalised distributions of D₅ for the total sample of OTELO objects, the AGNs, and the control sample (non-AGNs). The yellow distribution is the distribution of all the objects at z ∼ 0.4 and the cyan solid line is its Poissonian fit. The step histograms in red and black represent the distributions of D₅ for the AGN and non-AGN samples, respectively, while the corresponding dashed lines are their Poissonian fits. The filled bands show the propagation of statistical errors in the Poissonian fit.