Statistics of the photometric and spectroscopic redshifts. Left: photo-z posterior distributions as a function of SDSS spectroscopic redshift for LoTSS DR2 sources with reliable spectroscopic redshift (zwarning_sdss = 0) and photo-z estimates that pass the photo-z quality selection (flag_qual = 1). The photo-z distribution is normalized such that the distribution for each z_spec bin integrates to unity. Dashed and dotted lines illustrate the bounds z_phot = z_spec ± 0.05 and 0.15 × (1 + z) respectively. Right: the distribution of available redshifts for all optically identified objects as a function of WISE band 1 magnitude, where a ‘good redshift’ is defined in the text.