Post-Newtonian gravity and Gaia-like astrometry - Effect of PPN γ uncertainty on parallaxes Alexey G. Butkevich, Alberto Vecchiato, Beatrice Bucciarelli, Mario Gai, Mariateresa Crosta and Mario G. Lattanzi A&A, 663 (2022) A71 Published online: 18 July 2022 DOI: 10.1051/0004-6361/202243237