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Fig. 6

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Metallicity [Fe/H] as a function of UI colour according to TERAMO Models (Raimondo et al. 2005) for 11 and 13 Gyr old single stellar populations. The solid red line indicates the adopted piecewise linear approximation that we adopt for the transformation from UI to [Fe/H] in this paper, see Eqs. (1) and (2).

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