Table 6: References for the [O/Fe] and [Na/Fe] ratios from high resolution analyses in globular clusters used to derive the overall Na-O anticorrelation shape.

Cluster	stars	Reference
NGC 104 (47 Tuc)	SGB+TO	Carretta et al. (2004b)
	RGB	Norris & Da Costa (1995)
	RGB	Carretta (1994)
NGC 288	RGB	Shetrone & Keane (2000)
NGC 362	RGB	Shetrone & Keane (2000)
NGC 2808	RGB	Carretta et al. (2004a)
	RGB	present study
NGC 3201	RGB	Gonzalez & Wallerstein (1998)
NGC 5272 (M 3)	RGB	Cohen & Melendez (2005)
	RGB	Sneden et al. (2004)
NGC 5904 (M 5)	RGB	Ivans et al. (2001)
NGC 6121 (M 4)	RGB	Ivans et al. (1999)
NGC 6205 (M 13)	RGB+SGB+TO	Cohen & Melendez (2005)
	RGB	Sneden et al. (2004)
NGC 6254 (M 10)	RGB	Kraft et al. (1995)
NGC 6397	SGB+TO	Carretta et al. (2005) + Gratton et al. (2001)
	RGB	Norris & Da Costa (1995)
	RGB	Carretta (1994)
NGC 6528	RHB	Carretta et al. (2001)
NGC 6715 (M 54)	RGB	Brown et al. (1999)
NGC 6752	SGB+TO	Carretta et al. (2005) + Gratton et al. (2001)
	RGB	Yong et al. (2003)
	RGB	Norris & Da Costa (1995)
	RGB	Carretta (1994)
NGC 6838	RGB+SGB+TO	Ramirez & Cohen (2002)
NGC 7006	RGB	Kraft et al. (1998)
NGC 7078 (M 15)	RGB	Sneden et al. (1997)
Pal 5	RGB	Smith et al. (2002)
Pal 12	RGB	Cohen (2004)
Ter 7	RGB	Tautvaisiene et al. (2004)