Distribution of the 5 GHz radio power for different samples of PS samples. The distribution of the 5 GHz radio power for the 138 sources from the PS sample for which redshift data is available is shown in black (upper histogram). The green, blue, and orange histograms in the lower plot represent the 5 GHz radio power of the Snellen et al. (1998) PS sample, the O’Dea (1998) PS sample, and the Callingham et al. (2017) PS sample, respectively. The median redshifts of all distributions are plotted as dashed lines in their respective colours, in both the upper and lower plots. The median P_5 GHz value and the range of the 16th and 84th percentiles of the distributions of the samples in this study, Snellen et al. (1998), O’Dea (1998), and Callingham et al. (2017), are given by , , , and (log₁₀ W Hz⁻¹), respectively.