The parameter space covered by the new BOSZ grid. Top panel: T_eff–log 𝑔 diagram of the new BOSZ grid. Middle panel: [α/M] as a function of [M/H]. Bottom panel: [C/M] as a function of [M/H]. There are 336 different chemical compositions included in the database, and each composition has 322 MARCS and 173 ATLAS9 model atmospheres. The star density from APOGEE DR17 (Abdurro’uf et al. 2022) is the colored background and shows that the selected parameters cover most of the stars that are observed in the Milky Way.