tokens: We thank the anonymous referee for a prompt and constructive report that has improved the paper. Support for HST program GO-12922 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. D.P. acknowledges support through the EACOA Fellowship from the East Asian Core Observatories Association, which consists of the National Astronomical Observatories, Chinese Academy of Science (NAOC), National Astronomical Observatory of Japan (NAOJ), Korean Astronomy and Space Science Institute (KASI), and Academia Sinica Institute of Astronomy and Astrophysics (ASIAA). Research by A.J.B. is supported in part by National Science Foundation (NSF) grant AST-1412693. JHW acknowledges support by the National Research Foundation of Korea grant funded by the Korean government (No. 2010-0027910 and No. 2016R1A2B3011457). T.T. acknowledges support by the Packard Foundation through a Packard Research Fellowship and by the NSF through grant AST-1412315. V.N.B. gratefully acknowledges assistance from NSF Research at Undergraduate Institutions (RUI) grant AST-1312296. Note that the findings and conclusions do not necessarily represent the views of the NSF. R.J.A. was supported by FONDECYT grant number 1151408. We thank Jonelle L. Walsh for help with the STIS data reduction.
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