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Gaia DR 1 Open Cluster Astrometry: performance, limitations, and future prospects? F. van Leeuwen, A. Vallenari, C. Jordi, L. Lindegren, U. Bastian, T. Prusti, J. H. J. de Bruijne, A. G. A. Brown et al @ESAGaia @gaiaverse @GaiaUB https://t.co/gyYS5WWiU…