Validation of our metallicities with existing spectroscopic surveys such as GALAH DR3 (top left), and APOGEE DR17 (top right), and high-resolution spectroscopic samples of metal-poor stars from Hansen et al. (2018), Sakari et al. (2018), Yong et al. (2021), Li et al. (2022; bottom left), and SAGA database of VMP stars (bottom right). The number of stars, median (μ₅₀) and 1σ standard deviation (σ) in Δ[Fe/H] and median uncertainties on the metallicity measurements (where available) is indicated at the top and bottom of each panel. The dashed lines shows the 1:1 line and corresponding ±0.5 dex offsets.