Hertzsprung-Russell (HR) diagrams for the V-LoTSS × GCNS sample (left panel) and LoTSS × GCNS sample (right panel), according to Gaia G_BP – G_RP colour and Gaia G absolute magnitude. The radio-bright stellar systems are represented by different colours and symbols according to object classification, as shown in the legends. There exist two sources in the V-LoTSS × GCNS population that are beyond 50 pc, whereas only radio detections within 50 pc are included in the LoTSS × GCNS population to suppress chance-coincidence associations. The top axis of the HR diagrams indicates the nominal stellar spectral types (Pecaut & Mamajek 2013).