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tokens: This work was supported by NASA grant NNX10AD78G. 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 thank the referee, Tim Kallman, for his careful review of the paper and constructive comments. We thank A. Maeder, M. Catalan, and E. Behar for useful suggestions. We also thank G. Ferland and associates for their continuing maintenance of cloudy .