Proper use of (Gaia) astrometric data

This talk is aimed at providing guidance on the use of Gaia astrometric data, following the paper by Luri et al. (arXiv:1804.09376). In addition a subset of the material in the slideset by Lindegren et al.

(https://www.cosmos.esa.int/documents/29201/1770596/Lindegren_GaiaDR2_Astrometry_extended.pdf/1ebddb25-f010-6437-cb14-0e360e2d9f09) will be presented, focusing on systematic and correlated uncertainties in the Gaia catalogue.