tokens: The work of JHM and CK is supported by the Science and Technology Facilities Council (STFC), via studentships and a consolidated grant, respectively. The work of NSH is supported by NASA under Astrophysics Theory Program grants NNX11AI96G and NNX14AK44G. We would like to thank the anonymous referee for a helpful and constructive report, and we are grateful to A. F. Palah and B. T. Gaensicke for the IX Vel XSHOOTER data set. We would also like to thank J. V. Hernandez Santisteban, S. W. Mangham and I. Hubeny for useful discussions. We acknowledge the use of the IRIDIS High Performance Computing Facility, and associated support services at the University of Southampton, in the completion of this work.
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