Comparison of the MDF_S derived from CMD fitting (both with the BaSTI-IAC and PARSEC stellar evolution models, with two spectroscopic MDFs. Left panel: completeness in the CMD of the metallicity measurements from Gaia GSP-Spec (blue-yellow histogram) and CMD of the stars (in brown) measured by Fuhrmann et al. (2017) superimposed on the CMD of the GCNS (in grey). Middle panel: MDF obtained from Gaia GSP-Spec metallicities (Recio-Blanco et al. 2023) for stars in the GCNS. Right panel: MDF derived from Fuhrmann et al. (2017) stars within 25 pc of the Sun.