Centroid velocities at one-quarter intensity (c(1/4)) cumulative distributions of the samples separated by radio-loudness and redshift range for [O III]λ5007 (top panels) and C IVλ1549 (bottom panels). Kolmogórov-Smirnov tests were performed comparing different subsamples identified at the top of the panels. KS statistics for each comparison are shown in the top left corner of each plot together with the respective ρ-value. Vertical lines indicate the mean value for each subsample.