Maximum spreads in helium and sodium (namely ΔYini(AGB) and Δ[Na/Fe]ini(AGB)) predicted on the AGB for the four metallicities as a function of the age at the end of the helium-burning phase. The shaded areas are obtained for a value of η = 0.65 (shown only for the two extreme [Fe/H] values), while the other coloured areas are for η = 0.5 for the four [Fe/H] values considered (see inset).
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