Notes. The giants are ranked by projected proper length. The column ‘rank’ thus denotes each giant’s projected proper length rank within this new sample, not within the total known population. Lying outside of the coverage, some GRG host galaxies have no SDSS DR12 name. The column ‘host coordinates’ contains the central right ascension and declination of the host galaxy. The columns ‘redshift’ and ‘redshift type’ provide cosmological redshift estimates, derived from spectroscopy s or photometry p. The column ‘angular length’ denotes the largest great-circle distance between two LoTSS DR2–detectable GRG (end)points. These angular lengths may increase in future deeper surveys. We have not measured angular length errors on a case by case basis, but estimate them to be 0.15′. The column ‘projected proper length’ propagates both redshift and angular length uncertainty and assumes the Planck Collaboration VI (2020) cosmology. The columns ‘host stellar mass’ and ‘host SMBH mass’, further discussed in Sect. 3.6.4 and Appendix C, provide SDSS-derived estimates of host stellar and supermassive black hole masses. Finally, the column ‘host quasar’ indicates whether the host’s AGN has a quasar appearance: y (yes) or n (no). In cases where only a set of candidates containing the host galaxy could be established beyond reasonable doubt, we list the properties of the lowest-redshift candidate. In this way, the provided projected proper length bounds the actual projected proper length from below. In such cases, to signify uncertainty, we mark the host name, host coordinates, and physical host properties in grey. We note that this lowest-redshift candidate is often, but not always, also the most probable host. For access to these data for all 2060 newly discovered giants, see Appendix F.