Fig. 7.
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Location of the six GCs under study in the age–metallicity plane, overplotted on the age–metallicity relation derived from the halo CMD. GCs with undoubted in situ origin are shown as black symbols, while NGC 6388 and NGC 6441 are marked in white. The location of GES (black dashed line) and of the Milky Way thick disc (black ellipse) are shown for comparison.
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