Fig. 2
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Chemical abundance relations for members of NGC 6656 (colour) and ωCen (grey). The filled symbols show the reference sample of ω Cen (grey) and the stars of NGC 6656 (magenta) chemically compatible with it according to the GMM (see Sect. 4), while the empty ones (grey and orange colours) correspond to their outliers. The number of stars in each category is reported in parentheses.
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