tokens: ACKNOWLEDGEMENTS We are grateful for a careful reading of our paper and many helpful comments from an anonymous referee. The authors would like to thank Jay Lockman, Andrew Robinson, and Jeyhan Kartaltepe for helpful discussions. AL is supported by the National Radio Astronomy Observatory under the Student Observing Support program project GBT 16B-285. SC acknowledges support from National Science Foundation grant number 1517488. YS is partially supported by the National Natural Science Foundation of China (NSFC) grant 11603032. The authors would like to thank the Sloan Digital Sky Survey for making all their data public and easily accessible and Barbara Catinella and the GASS collaboration for making their data public. The National Radio Astronomy Observatory and the Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non- HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.
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