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tokens: The authors would like to offer their thanks to the anonymous referee of the original manuscript for their constructive comments and suggestions. Based on observations made with the NASA/ESA Hubble Space Telescope , obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #14125. The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize the significant cultural role that the summit of Maunakea has always had within the indigenous Hawai’ian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This research has made use of the Keck Observatory Archive (KOA), which is operated by the W. M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with the National Aeronautics and Space Administration. The authors also acknowledge Shri Kulkarni as the PI of Keck program ID C254LA. We also acknowledge the Keck observer Yi Cao. The authors would like to thank the HST staff for their heroic efforts scheduling our early-time, and disruptive, spectroscopic observations. Particular thanks are given to Charles R. Proffitt, the STScI Contact Scientist for programme #14125, for his support with the STIS observations. M.J.D. would like to personally thank Julianne Dalcanton for guidance with the PHAT extinction studies, Laura Darnley (née Wisson) for reading chemistry(!), Toby Moore for useful discussions about interstellar extinction, and Steve Shore and Iain Steele for their spectroscopic insight. P.G. wishes to thank William (Bill) P. Blair for his kind hospitality in the Rowland Department of Physics Astronomy at the Johns Hopkins University. M.H. acknowledges the support of the Spanish Ministry of Economy and Competitiveness (MINECO) under the grant FDPI-2013-16933 as well as the support of the Generalitat de Catalunya/CERCA programme. N.P.M.K. acknowledges funding from the UK Space Agency. S.C.W. acknowledges a visiting research fellowship at Liverpool John Moores University. K.H. was supported by the project RVO:67985815. V.A.R.M.R. acknowledges partial financial support from the Radboud Excellence Initiative, from Fundação para a Ciência e a Tecnologia (FCT) in the form of an exploratory project of reference IF/00498/2015, from Center for Research Development in Mathematics and Applications (CIDMA) strategic project UID/MAT/04106/2013 and from Enabling Green E-science for the Square Kilometer Array (ENGAGE SKA) ROTEIRO/0041/2013/022217. This work has been supported in part by NSF grant AST-1009566. Support for program #14125 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. Facilities: HST (STIS) , Keck:I (LRIS) . Software: gnuplot (v5.0.6), IRAF (v2.16.1, Tody 1993 ), PGPLOT (v5.2).