Hertzsprung-Russell (HR) diagram for the VLASS × GCNS sample 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. The green triangles represent stellar systems that are likely to be chromospherically active from the literature. The radio sources here are all within 50 pc, as cross-matching the entire GCNS would lead to significant coincidence associations with VLASS sources. The top axis of the HR diagrams indicates the nominal stellar spectral types (Pecaut & Mamajek 2013).