Distribution of TO stars in the [Li/Na]−[Na/O] plane. Stars are color-coded according to (a) | Δvr |, which is the absolute radial velocity of a given star in the reference system of the cluster (top panel); and (b) distance of each individual star from the cluster center, r/rh (bottom panel). Solid lines delineate boundaries used to divide stars into groups P, I, and E (see Sect. 3 for details).
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