Variations of degrees of polarization, RRM and redshift values. Left and middle panels: degree of polarization and |RRM| as a function of redshift. The sample was split to have a roughly equal number of sources in each redshift bin. Data points from sources with spectroscopic or photometric redshifts are indicated in different colors, as indicated in the legend. The horizontal bars indicate the sizes of the redshift bins, and the vertical bars show the standard errors of the values in the vertical axis. For each plot, the blue squares represent the means of the values in each bin. In the left panel, the gray line is the fit from Carretti et al. (2022) to corresponding data from the LoTSS-DR2 RM grid catalog. Right panel: |RRM| vs. degree of polarization.