tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for a constructive referee report which greatly improved this manuscript. The authors thank Glenn van de Ven, Morgan Fouesneau, Anna Lisa Varri, Gigi Leung, Diederik Kruijssen, Carme Gallart, and Matteo Monelli for useful discussions which improved the manuscript. Dedicated to BL. RL thanks AH. This work was made possible with funding from the Natural Sciences and Engineering Research Council of Canada PDF award and supported by Sonderforschungsbereich SFB 881 ‘The Milky Way System’ (subproject A7 and A8) of the German Research Foundation (DFG), and Deutscher Akademischer Austauschdienst (DAAD) PPP project number 57316058 ‘Finding and exploiting accreted star clusters in the Milky Way’. TRL acknowledges support via grants AYA2014-56795-P and AYA2016-77237-C3-1-P from the Spanish Government. PB acknowledges financial support from a Canadian Institute for Theoretical Astrophysics (CITA) National Fellowship. MAB and JFB acknowledge support from grant AYA2016-77237-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO) and from the Severo Ochoa Excellence programme SEV-2015-0548.
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