tokens: The authors thank the helpful referee for constructive and important comments. B.V. also thanks E. van Groningen for helpful comments, Brad Peterson for showing the AGN black hole mass database and A. Magnard, F. Poulenc, G. von Rivia and J. Pianist for inspiring discussions. She also acknowledges A. Barth, H. Netzer and M. Elitzur for help with the intermediate line region. B.V. was funded and supported by the Centre of Interdisciplinary Mathematics (Uppsala Universitet) and Erik and Märta Holmbergs donation from Kungliga Fysiografiska Sällskapet. This research also heavily relies on the Sloan Digital Sky Survey (SDSS). Funding for SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the Japanese Monbukagakusho, and the Max Planck Society.
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