Sculptor (I, V − I) colour magnitude diagram of the central region overlaid with regions identifying the different stellar populations. BHB: blue horizontal branch, RHB: red horizontal branch, RGB: red giant branch, BSS: blue straggler stars, MSTO: main sequence turn-off. In the RGB box numerous AGB stars can also be observed. A box is also included which provides an estimate of the contamination by foreground stars from the Milky Way (FG). Photometric errors are shown as the size of the errorbar at the corresponding magnitude level.
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