Comparison of metallicities from different catalogues. Left: comparison of the Gaia metallicities (x-axis) with the spectroscopic determinations of Li et al. (2022a,b), and Wang et al. (2022), shown as red triangles, green squares, and grey symbols, respectively. Middle: same as middle panel but comparing the spectroscopic metallicities with the determination from Andrae et al. (2023) on the x-axis. Right: same as other panels but with metallicities from Zhang et al. (2023) on the x-axis.