Left: [Na/Fe] and [O/Fe] vs. [Fe/H], right: [Na/Fe] vs. [O/Fe] showing the Na:O anti-correlation in GCs. Magenta dots are our results for H11, in red other LMC data: triangles are results from J06, open circles are results from Pompéia et al. (2008), stars are results from Mucciarelli et al. (2008) and M10; in black filled circles are GGC data from Carretta et al. (2009) and Lee & Carney (2002), in blue squares dSph galaxies from Shetrone et al. (2001), Sbordone et al. (2007) and Monaco et al. (2005). Error bars stands for σ_tot from Table 2.