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tokens: ACKNOWLEDGEMENTS We are grateful to Peter Camps for code support, interesting discussion, and the development of skirt . We thank Ricardo Amorin, Ilse De Looze, Hiroyuki Hirashita, Roberto Maiolino for helpful discussion, and Nicolas Laporte for providing data. AF acknowledges support from the ERC Advanced Grant INTERSTELLAR H2020/740120. We acknowledge the use of the python programming language (Van Rossum de Boer 1991 ), and use of the numpy (van der Walt, Colbert Varoquaux 2011 ), ipython (Perez Granger 2007 ), jupyter (Kluyver et al. 2016 ), matplotlib (Hunter 2007 ), and pymses (Labadens et al. 2012 ) packages. This research made use of astropy , a community-developed core python package for Astronomy (Astropy Collaboration et al. 2013 ).