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Fig. 1


Gaussian mixture method analysis of the [α/ Fe] abundance distribution with respect to the median values along the sequence. The inner panel shows the Akaike information criterion for different numbers of components. The best fit (green curve) corresponds to the two-component mixture. The red curve shows the poorer quality fit of the single Gaussian component, whose probability of explaining the distribution is 21 times lower than the double Gaussian component.

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