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tokens: ACKNOWLEDGEMENTS We thank John O’Meara, Scott Burles, David Tytler, and Chris Gelino for their feedback about HIRES data used by BT ; Tristan Dwyer for running his code identifying absorption systems for us; Serj Balashev and Michael Wilczynska for useful discussions; an anonymous referee for valuable comments. EOZ was supported by an Australian Government Research Training Program (RTP) Scholarship. Work of SRS was funded by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. EOZ is grateful for the hospitality of the Institute of Theoretical Astrophysics at the University of Oslo during his visit in 2016 January–February. JKW thanks the Centre for Mathematical Sciences in Cambridge for an enjoyable and productive Sabbatical visit. This work is based on observations collected with 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. A significant part of the analysis and figures were done using publicly available python packages: matplotlib (Hunter 2007 ), numpy (Van Der Walt, Colbert Varoquaux 2011 ), scipy (Oliphant 2007 ), astropy (Astropy Collaboration 2013 ), barak 11 by Neil Crighton, and qscan (Dumont 2017 ). This research has made use of NASA’s Astrophysics Data System. EOZ is also grateful to GitHub for the Student Developer Pack.