tokens: We thank Uwe Lammers, who contributed to the idea and progress of this study, and its funding under ESA Contract No. 4000108677/13/NL/CB. We are grateful to Ulrich Bastian, Alex Bombrun, Anthony Brown, Sergei Klioner, Uwe Lammers, Paul McMillan, Mercedes Ramos-Lerate, and the referee, Floor van Leeuwen, for their helpful feedback to our manuscript. This work was supported by the Gaia Data Processing and Analysis Consortium (DPAC) and uses the AGIS/AGISLab and GaiaTools software packages; special thanks to their maintainers and developers. We gratefully acknowledge financial support from the Swedish National Space Board and the Royal Physiographic Society in Lund.
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