a) Sculptor (B − V), (V − I) colour–colour diagram (black points) overlaid with colour-coded CMD regions: horizontal branch (light-blue), RGB/SGB (green), MSTO (dark blue), MW foreground (red) and unresolved galaxy background (yellow). b) (V, B − V) and (I, V − I). (c) Colour magnitude diagrams with the same colour-coding.
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