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tokens: Laurent Chemin acknowledges the financial support from CNES. We are grateful to an anonymous referee whose suggestions led to clarify the discussion, content, and structure of the manuscript. 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 ( http://ned.ipac.caltech.edu ). We acknowledge the usage of the HyperLeda database ( leda.univ-lyon1.fr ). The SDSS image is from cosmo.nyu.edu/hogg/rc3 , prepared by David W. Hogg, Michael R. Blanton, and the Sloan Digital Sky Survey Collaboration.