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Fig. 4
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CMD of M 54 with, superimposed, three different isochrones with the same age (12 Gyr) but a different [Fe/H]. The solid cyan isochrone has [Fe/H]=−1.8 dex, the dash-dotted orange isochrone has [Fe/H]=−1.4 dex, and the dashed red isochrone has [Fe/H] = −1.1 dex.
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