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The Gaia mission is a magnitude-limited whole-sky survey that collects animpressive quantity of astrometric, spectro-photometric and spectroscopic data.Among all the on-board instruments, the Radial Velocity Spectrometer (RVS)produces millions of spectra up to a magnitude of G$_{RVS} \sim 16$. For thebrightest RVS targets, stellar atmospheric parameters and individual chemicalabundances are automatically estimated by the Generalized Stellar Parametriser- spectroscopy group (GSP-Spec). These data will be published with the thirdGaia Data Release. Some major ingredients of the determination of these stellarparameters include the atomic and molecular line lists that are adopted tocompute reference synthetic spectra, on which the parametrisation methods rely.We aim to build such a specific line list optimised for the analysis of RVSlate-type star spectra. Starting from the Gaia-ESO line lists, we firstcompared the observed and synthetic spectra of six well-known referencelate-type stars in the wavelength range covered by the RVS instrument. We thenimproved the quality of the atomic data for the transitions presenting thelargest mismatches. The new line list is found to produce very high-qualitysynthetic spectra for the tested reference stars and has thus been adoptedwithin GSP-Spec.

GSP-spec line list for the parametrisation of Gaia -RVS stellar spectra