Fig. 1
Assignation of stars to the different groups in our k-means analysis in the [La/H] vs. [Na/O] plane. This plane roughly corresponds to that of the second and first component in a principal component analysis. Different colours are for stars of the different groups: green: group #1; red: group #2a; yellow: group #2b; violet: group #3; blue: group #4; black: group #5; cyan: group #6.
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