Fig. 1.
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Dn4000 (top) and Hβ (bottom) trends with age and metallicity. The indices are shown for a sample of 75 GCs for which a literature value of age is available, divided into six [Fe/H] bins and colour-coded according to it. In the background, the stellar models from BC16 relative to each [Fe/H] bin are shown with different line styles.
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