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Fig. 15.
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Distribution of some properties of selected samples of ULXs and HLXs. Left: distance of the host. ULXs are detected up to 500 Mpc and HLXs up to 1100 Mpc. Right: 0.5–10 keV observed mean X-ray luminosity of the 191 HLXs candidates, including the 22 galaxy pair candidates.
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