Distribution of [α/Fe] abundances with respect to [M/H] for the subsample of GCs with more reliable abundances. Error bars are based on the abundance dispersion within the cluster. A metallicity offset of 0.1 dex with respect to the literature is observed and corrected. Globular cluster stars are generally in the low-S/N regime of the GSP-Spec sample and need more deblending corrections of their spectra due to the crowding. The colour code reflects the GC L_Z median values in solar units. In the background, a density plot with the RGB stars sample distribution is presented.