Luminosity at 5 GHz versus radio source size proposed by Sobolewska et al. (2019a; S19). Literature data are selected as in Sect. 6.1. 1718–649 and 1146+596 are marked with squares. Color coding indicates the intrinsic equivalent hydrogen column density measured from the X-ray spectra. Red and blue solid lines mark the linear relations fitted on obscured (N_H ≥ 10²³ cm⁻²) and unobscured (N_H <  10²³ cm⁻²) sources, where p0 and p1 are the angular coefficient and the normalization, respectively. The r-val stands for the Pearson correlation coefficient. Figure adapted from S19.