tokens: We thank the anonymous referee for constructive criticism that helped to improve the readability of the paper. We thank A. Biviano, H. Böhringer, and J. Dietrich for their numerous suggestions that helped this work. Furthermore, we thank A. L. Serra and A. Diaferio for the communication on the caustic method and kindness to cross-check our results with their code, as well as Heinz Andernach for his hint on a case with a lack of clearity. The Guide Star Catalogue-II is a joint project of the Space Telescope Science Institute and the Osservatorio Astronomico di Torino. Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, for the National Aeronautics and Space Administration under contract NAS5-26555. The participation of the Osservatorio Astronomico di Torino is supported by the Italian Council for Research in Astronomy. Additional support is provided by European Southern Observatory, Space Telescope European Coordinating Facility, the International GEMINI project and the European Space Agency Astrophysics Division. We have made use of VLT/VIMOS observations taken with the ESO Telescope at the Paranal Observatory under programme 087.A-0096 and WFI observations partially supported by the Deutsche Forschungsgemeinschaft (DFG) through Transregional Collaborative Research Centre TRR 33. The XMM-Newton project is an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA). The XMM-Newton project is supported by the Bundesministerium für Wirtschaft und Technologie/Deutsches Zentrum für Luft- und Raumfahrt (BMWI/DLR, FKZ 50 OX 0001) and the Max-Planck Society. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We used the version 13SEPpl1.4 of ESO-MIDAS for data reduction and STILTS 1 for table processing and plotting of figures. Y.Y.Z. acknowledges support by the German BMWi through the Verbundforschung under grant 50 OR 1506. T.H.R. acknowledges support from the DFG through the Heisenberg research grant RE 1462/5.
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