Stellar abundance ratios [Mg/Fe] vs. [Fe/H] of the X-shooter catalogue after applying the optimal method. From left to the right, we show the derived abundances from the considered Mg Ib triplet lines with the estimated internal uncertainties as vertical error bars and each individual line separately: 5172.7 Å and 5183.6 Å. The red line reproduces the empirical [α/Fe] approach adopted in the analysis when no reliable values from Gaia DR3 are found.