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tokens: We thank the anonymous referee for helpful comments that greatly improved the presentation of this paper. We also thank H.J. Mo and Frank C. van den Bosch for useful discussions. This work is supported by the 973 Program (No. 2015CB857002), NSFC (Nos. 11128306, 11121062, 11233005), the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences, Grant No. XDB09000000, and a key laboratory grant from the Office of Science and Technology, Shanghai Municipal Government (No. 11DZ2260700).