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tokens: Acknowledgements We thank the anonymous referee for his/her useful comments and suggestions. L.M. acknowledges support from “Proyecto interno” of the Universidad Andres Bello. P.B. acknowledges financial support from the Scientific Council of Observatoire de Paris and from the action fédératrice “Exploitation Gaia”. S.V. gratefully acknowledges the support provided by Fondecytreg. n. 1170518.