Diagrams of [Mg/Fe] versus [Fe/H], and [Mg/Mn] versus [Al/Fe] for our GE. Stars selected with [Fe/H] ≤ −0.8 are shown in grey. The stars of the GE-dominated cluster are shown in other colours (347 stars in the left panel; 94 stars in the right panel). Black crosses are (43) stars with high [Al/Fe] ratios and thus are likely of in situ origin. Green star symbols are objects with low [Al/Fe] ratios or without Mn and/or Al abundances of good quality. The latter group is likely dominated by stars of accreted origin. Left: [Mg/Fe] by [Fe/H] diagram. Right: [Mg/Mn] by [Al/Fe] diagram.