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The Gaia mission has made more than three trillion observations of two billion stars and other objects throughout the Milky Way galaxy and beyond, mapping their motions, luminosity, temperature and composition. Thanks to a powerful large statistics, homogeneity, precision and spectral fidelity, the Gaia RVS chemical cartography is revolutionising our understanding of the disc chemical abundances. In this talk, I will present several aspects of this revolution. First of all, I will illustrate the Gaia RVS spectral fidelity, unexpected for a large part of the scientific community, showing comparisons with asteroseismic data and other scientific validation examples. Then, I will present different results on Galactic disc populations as the chemical signature of the spiral arms, the double RGB sequences of the thin and thick disc, the chemical pattern of the disc kinematical perturbances, and evidence of a recent gas infall event. Finally, I will present the future prospects of the Gaia mission for the next two data releases (DR4, December 2026 and DR5 in 2030). |
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