Left: dereddened CMD for the easternmost pointing probing the leading arm in the southern hemisphere; the template main sequence function and the turnoff point (green) are plotted for the maximum of the secondary cross-correlation. We have randomly removed 50% of the stars contributing to the primary detection, which corresponds to the southern-trailing arm of the Sgr stream. Right: weighted-density diagram resulting from the secondary cross- correlation. The maximum (white bin, black cross) marks the top left corner of the template-MS function at the position of the southern leading arm main sequence. The primary detection has been partially removed, and the remainings can be seen as a weak tail at fainter magnitudes and slightly bluer colour.
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