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tokens: It is a pleasure to thank Maosheng Xiang and Ted Mackereth for providing us insights on their results for our safety checks, and Gregory Green for practical help on using the Bayestar17 extinction map. We thank Diane Feuillet and Andy Gould for useful discussions on APOGEE selection function, and Alina Boecker and Ryan Leaman for advice on stellar populations. We are grateful to Sofia Feltzing and Paul McMillan for helping to improve the clarity of the writing. This project was developed in part at the 2018 NYC Gaia Sprint, hosted by the Center for Computational Astrophysics of the Flatiron Institute in New York City and at the 2018 Gaia –LAMOST hack-a-thon, held in Shanghai. N.F. acknowledges support from the International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg (IMPRS-HD). H.-W.R. received support from the European Research Council under the European Union’s Seventh Framework Programme (FP 7) ERC Grant Agreement n. [321035]. Y.S.T. is grateful to be supported by the NASA Hubble Fellowship grant HST-HF2-51425 awarded by the Space Telescope Science Institute. The following software was used during this research: Astropy (Astropy Collaboration et al. 2013 ), Galpy (Bovy 2015 ) Matplotlib (Hunter 2007 ).