tokens: We thank the referee for their insightful comments that improved the paper quality. We thank Maïca Clavel for useful discussions about the X-ray data analysis. J.S. and I.O. acknowledge financial support from the Czech Science Foundation project No.17-06217Y. I.O. is grateful to Université Grenoble Alpes IPAG for their hospitality during the paper preparation. We have made use of the SDSS, ADS, and NED databases.
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