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tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for their comments and suggestions that improved the analysis and the presentation of the results. FV and WNB thank NASA XMM–Newton grant 80NSSC18K0487 and the NASA ADAP program for support. BL acknowledges financial support from the National Key RD Program of China grant 2016YFA0400702 and National Natural Science Foundation of China grant 11673010. We warmly thank J. Runnoe and Z. Shang for useful discussion on UV SED shape of quasars.