tokens: We thank the anonymous referee for helpful suggestions that improved the quality of the paper. LZ and YS acknowledge support for this work from the National Natural Science Foundation of China (grant 11373021), the Strategic Priority Research Program ‘The Emergence of Cosmological Structures’ of the Chinese Academy of Sciences (grant No. XDB09000000), and Excellent Youth Foundation of Jiangsu Scientific Committee (grant BK20150014). LZ also thanks for the support by the National Natural Science Foundation of China (Grant No. J1210039). AL is supported in part by NSF AST-1311804 and NASA NNX14AF68G. This research has made extensive 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. This work is based (in part) on observations made with the Spitzer Space Telescope , which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.’ The Galaxy Evolution Explorer ( GALEX ) is a NASA Small Explorer, launched in 2003 April. We acknowledge NASA's support for construction, operation, and science analysis for the GALEX mission.
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