Fig. 5.
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Potassium-oxygen and potassium-magnesium data for the GC NGC 2808 (open circles) from Carretta (2015) and Mucciarelli et al. (2015). For all the symbols, see Fig. 3. Depletion for 6.5 M⊙ with [Fe/H] reduced by 0.1 dex is shown by the open squares. The upper point (δ[K/Fe] = 0.125) is obtained by doubling the argon initial abundance. See text for further information.
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