Fig. 18
[O/Fe] vs. [Na/Fe] for BHB stars (left panel) and RGB stars from Marino et al. (2011a: right panel). In the left panel different colours are for stars of different groups (see Sect. 4). Group 1: red filled squares; Group 2: black open squares; Group 3: blue filled triangles. Typical error bars for our analysis are also shown.
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