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tokens: Acknowledgements ME and HH acknowledge support from the European Research Council under FP7 grant number 279396. The authors thank Jerome Amiaux, Mark Cropper, Jean-Charles Cuillandre, Thomas Kitching, Yannick Mellier, Jason Rhodes, and Gijs Verdoes Kleijn for discussions and comments. In this project we used the scikit-learn (Pedregosa et al. 2011 ), pandas (McKinney 2010 ), scipy (Jones et al. 2001 ), matplotlib (Hunter 2007 ), and ipython (Perez Granger 2007 ) software packages. This research has made use of NASA's Astrophysics Data System.