Fig. 7
Metallicity distribution of stars in our sample in different radial annuli around the centre of M 54/Sgr, N. The distributions are in the form of generalised histograms normalised at their maximum. The thin vertical lines are for reference and are placed at [Fe/H] =−1.50 and [Fe/H] =−0.5, near the mean of the two peaks, corresponding to M 54 and Sgr, N.
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