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tokens: ACKNOWLEDGEMENTS I thank V. Belokurov, D. Erkal, N. W. Evans, N. Hambly, S. Koposov, and the anonymous referee for valuable suggestions. This work relied exclusively on the data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium. This work was supported by the European Research council under the 7th Framework programme (Grant No. 308024).