Distribution of [M/H] estimates in Gaia DR3 from GSP-Phot (orange) and GSP-Spec (blue). As recommended in Recio-Blanco et al. (2023c) and Andrae et al. (2023), we selected the GSP-Spec estimates that have their 13 first bits flagged as equal to zero and GSP-Phot estimates with good parallax S/N. Nevertheless, we indicate the full distribution with the thin blue and orange lines, respectively. Andrae et al. (2023) suggest caution be exercised when using their estimates below [M/H] ∼ − 2 dex as their uncertainties are large. We shaded the region above the metal-poor regime. Overall the Gaia DR3 astrophysical parameter estimates have limited coverage of metal-poor stars: there are only four stars with [M/H] < −2 dex after using the flags from GSP-Spec and of unclear quality for GSP-Phot.