tokens: Acknowledgements The authors thank the anonymous referee for their constructive comments that have improved the quality of the paper. The authors also thank Ana Duarte-Cabral, Paul Clark and Camilo Peñaloza for many helpful discussions relating to this work. A.J.R. would like to thank the STFC for postdoctoral support under the consolidated grant number ST/N000706/1, as well as funding for a Ph.D. studentship. S.E.R. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement # 706 390. This research made use of Astropy ( https:// astropy.org/ ), a community-developed core Python package for Astronomy ( Astropy Collaboration 2013 , 2018 ), as well as iPython ( https://ipython.org/ ), an enhanced interactive Python ( Perez Granger 2007 ), and the Python packages NumPy ( https://numpy.org/ ; Oliphant 2006 ), SciPy ( https://scipy.org/ ; Jones et al. 2001 ), and Matplotlib ( https://matplotlib.org/ ; Hunter 2007 ). This publication has also made use of TOPCAT ( http://www.star.bris.ac.uk/~mbt/topcat/ ), an interactive graphical viewer and editor for tabular data software ( Taylor 2005 ), and SAOImageDS9 ( http://ds9.si.edu/ ; Joye Mandel 2003 ), an astronomical imaging and data-visualization application. The James Clerk Maxwell Telescope has historically been operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the National Research Council of Canada and the Netherlands Organisation for Scientific Research. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency, and has made use of the NASA Astrophysical Data System. The Starlink software ( Currie et al. 2014 ) is currently supported by the East Asian Observatory.
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