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Fig. 4

image

Panel a) [Na/Fe] distribution for the 133 bright red giants observed in NGC 6752 by Carretta (2013). Panel b) data from Carretta (2013) presented in panel a) adapted to be used in the FRMS framework. Panel c) initial [Na/Fe] distribution. Panel d) initial helium mass fraction inferred from the theoretical distribution for the initial sodium abundance in the framework of the FRMS scenario.

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