[Fe/H] difference between GES and Gaia DR3 for the stars in common. The GES samples GIRAFFE (all setups) and U580 are plotted in different colours. The horizontal red lines mark the median difference U580 – Gaia DR3 calibrated metallicity (continuous line) and ±1σ (dot-dashed lines). The green lines indicate the median difference GIRAFFE – Gaia DR3 calibrated metallicity (continuous line) and ±1σ (dot-dashed lines).