tokens: The authors would like to thank Charles Danforth and John Stocke for very helpful discussions and for assistance with reducing and co-adding COS data and the anonymous referee for thoughtful reports which helped to improve this work. Based on observations made with the NASA/ESA HST , and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). STScI is operated by the association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555.
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