Upper Gaia DR3 CMD for all members of the Sculptor dSph, colour-coded by [Fe/H] as in Fig. 22. The eight cyan stars symbols come from the carbon star catalogue of Azzopardi et al. (1985), and the three open cyan circles are C-rich stars from later studies. Magenta star symbols are stars with [Fe/H]<  − 3 in our sample, while green circles are those with −3 < [Fe/H]<  − 2.5. BASTI isochrones from Fig. 22 are in dashed coloured lines, with the early AGB evolutionary phase shown as solid lines.