1.4 GHz power of radio galaxies vs. X-ray luminosity of the host cluster for the eFEDS and P20 samples. The colours correspond to the redshift. eFEDS data are represented by circles, while diamonds are COSMOS systems. Downward-pointing arrows denote radio upper limits. Bars represent errors on both axes. Errors on the y-axis are dominated by the assumed uncertainty on the spectral index. The best-fit relation is shown in grey: log L_R = (0.84 ± 0.09) log L_X−(6.46 ± 4.07).