tokens: This work was supported by NASA ATP Grant NNX14AP92G and NSF Grant AST-1716762. K.K. acknowledges support by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE-1324585. S.C. acknowledges support from CIERA, the National Aeronautics and Space Administration through a Chandra Award Number TM5-16004X/NAS8-03060 issued by the Chandra X-ray Observatory Center (operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060), and Hubble Space Telescope Archival research grant HST -AR-14555.001-A (from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555).
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