Fig. C.1.
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[Fe/H]C as a function of apparent G magnitude for member stars of NGC 104 and NGC 6752 included in our catalogue. Points are colour-coded according to their uncertainty in the photometric metallicity ϵ[Fe/H]C. The thick horizontal lines are the value of the mean spectroscopic metallicity as tabulated in the 2010 edition of the Harris (1996) catalogue. The red horizontal branch stars of NGC 104 lie around G ≃ 14.2.
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