tokens: Acknowledgements We would like to thank F. La Barbera for a referee report that greatly improved this work, as well as for making available the Na-MILES models used in this paper. SPV would like to thank P. Alton for fruitful discussions on the effect of Na on stellar atmospheres and A. Ferré-Mateu for making her optical measurements of NGC 1277 available. This paper made use of the astropy python package (Astropy Collaboration et al. 2013 ), as well as the matplotlib (Hunter 2007 ) and seaborn plotting software (Waskom et al. 2017 ) and the scientific libraries numpy (Van Der Walt, Colbert Varoquaux 2011 ) and scipy (Jones et al. 2001 ). The Oxford SWIFT integral field spectrograph was supported by a Marie Curie Excellence Grant from the European Commission (MEXT-CT-2003-002792, Team Leader: N. Thatte). It was also supported by additional funds from the University of Oxford Physics Department and the John Fell OUP Research Fund. Additional funds to host and support SWIFT at the 200-inch Hale Telescope on Palomar were provided by Caltech Optical Observatories. This work was supported by the Astrophysics at Oxford grants (ST/H002456/1 and ST/K00106X/1) as well as visitors grant (ST/H504862/1) from the UK Science and Technology Facilities Council. SPV is supported by a doctoral studentship supported by STFC grant ST/N504233/1. RCWH was supported by the Science and Technology Facilities Council (STFC grant numbers ST/H002456/1, ST/K00106X/1 ST/J002216/1). RLD acknowledges travel and computer grants from Christ Church, Oxford, and support from the Oxford Hintze Centre for Astrophysical Surveys, which is funded through generous support from the Hintze Family Charitable Foundation.
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