tokens: We thank the anonymous referee for a careful review and suggestions that improved the manuscript. This research was partially supported by a Jet Propulsion Lab/NASA grant to the University of Minnesota (RSA 1541900/NNN12AA01C). Support for HST Programs GO-11696, 12283, 12568, 12902, 13517, 13352, and 14178 was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. T.G. is grateful to the LABEX Lyon Institute of Origins (ANR-10-LABX-0066) of the Université de Lyon for its financial support within the program “Investissements d’Avenir” (ANR-11-IDEX-0007) of the French government operated by the National Research Agency (ANR). This research has made use of NASA’s Astrophysics Data System Bibliographic Services.
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