tokens: We thank the anonymous referee for constructive comments which helped us to improve this paper. We are grateful to Kathryn Kreckel for providing us the filtered density contrast of the galaxies from Grogin Geller ( 1999 ) and to Margaret Geller for valuable discussion. EMC was supported by Padua University through grants 60A02-5857/13, 60A02-5833/14, 60A02-4434/15, CPDA133894, and BIRD164402/16. EMC acknowledges the Max-Planck-Institut fr extraterrestrische Physik for the hospitality while this paper was in progress. This investigation was based on observations obtained at the Michigan-Dartmouth-MIT (MDM) Observatory and at the Gemini Observatory under program GN-2011B-9-80. MDM Observatory, Kitt Peak, Arizona is operated by a consortium of Dartmouth College, the University of Michigan, Columbia University, the Ohio State University, and Ohio University. Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnologa e Innovacin Productiva (Argentina), and Ministrio da Cincia, Tecnologia e Inovao (Brazil). Parts of the data used in this research were acquired through the Sloan Digital Sky Survey (SDSS) Archive ( http://www.sdss.org/ ). Funding for the creation and distribution of the SDSS Archive has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the US Department of Energy, the Japanese Monbukagakusho, and the Max Planck Society. The SDSS is managed by the Astrophysical Research Consortium (ARC) for the Participating Institutions. The Participating Institutions are The University of Chicago, Fermilab, the Institute for Advanced Study, the Japan Participation Group, The Johns Hopkins University, the Korean Scientist Group, Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPI), the Max-Planck-Institute for Astrophysics (MPA), New Mexico State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington. This research also made use of the HyperLeda Database ( http://leda.univ-lyon1.fr/ ) and 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/ ).
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