Images of a random sample of new HLX candidates. The images are structured as follows: Cols. (1,2), (3,4) and (5) display CSC2, 4XMM-DR11 and 2SXPS candidates, respectively. (odd numbers) and (even numbers) rows show the X-ray and optical image at the same scale – the white line corresponds to 10 arcsec. Rows (1,2), (3,4) and (5,6) correspond to galaxy pair, robust and weak candidates, respectively. These candidates have the following names: 1–2CXO J124208.4+331854, 2–2CXO J025921.5+132913, 3–4XMM J123441.0+020846, 4–4XMM J104444.7−012018, 5–2SXPS J164652.0+234011, 6–2CXO J082215.9+210535, 7–2CXO J105210.4+552243, 8–4XMM J062447.9−372122, 9–4XMM J125708.6−044144, 10–2SXPS J111416.1+481833, 11–2CXO J005151.7+474019, 12–2CXO J131133.3−011656, 13–4XMM J083235.2−225804, 14–4XMM J145753.6−113959 and 15–2SXPS J115109.2+570340. X-ray images correspond to the Chandra and XMM-EPIC images displayed in ESASky, or the science exposures of Swift-XRT where the green circle has a 10 arcsec radius. Optical images come from the PanSTARRS survey (Chambers et al. 2016), except candidate 8 (Digitized Sky Survey, McLean et al. 2000) as it lies in a region not covered by PanSTARRS. The 3σ X-ray position error circle is shown in cyan.