Fig. 1
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[Mg/Fe] vs. [Fe/H] distribution of stars belonging to ω Cen, colour-coded according to the different components retrieved when minimising the BIC criterion in the GMM. Filled symbols represent the reference sample of stars of ω Cen (i.e. stars with a probability density above a threshold defined in Sect. 4), while empty symbols are the outliers (i.e. stars below this threshold).
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