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Fig. 9
[Na/H] (NLTE) as a function of [Fe/H] for RGB (left) and AGB (right) stars in the nine GCs discussed in this paper (our analysis for NGC 104, NGC 2808, NGC 6121, NGC 6809, and NGC 6752; literature data for NGC 5904, NGC 5986, NGC 6205, and NGC 6266) and in Galactic field stars from Carretta (2013, gray points).
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