Gaia colour-magnitude diagram for all 137 RASS and eRASS1 radio- and X-ray-emitting stars. The markers represent stellar classifications reported in (SIMBAD). The interacting binaries include the RS CVn, eclipsing, and spectroscopic binaries. Evolved stars comprise classical cepheids and long-period variables. The G-type, K-type, and M-type classifications are based on the Gaia astrophysical parameter catalogue (Gaia Collaboration 2023). The grey circles all represent Gaia DR3 sources within 100 pc of Earth, binned in uniform colour and magnitude. Large open circles represent the six detections in RASS that are not present in eRASS1, whereas the open squares show the 56 detections in eRASS1 that are absent in RASS and within 1kpc; the open hexagon markers show the 34 eRASS1 stars farther than 1 kpc away.