All Figures

	Figure 1: Top panel: average H spectrum for the stars with Giraffe spectra with S/N>25. Superimposed are synthetic spectra computed for gravities and metal abundances appropriate for the program stars and various values of  (=5600, 5800, 6000, 6200, 6400, 6600 K). The limits of the bands used are also shown as vertical marks. Bottom panel: ratios between observed and synthetic spectra.
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In the text

	Figure 2: Top panel: effective Temperature - B-V colour diagram for the stars observed with GIRAFFE; Left panel: effective Temperature - V magnitude diagram for the same stars; right panel: B-V colour - V magnitude diagram for the same stars.
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In the text

Figure 3: [Na/Fe] ratio as a function of [O/Fe] for stars in NGC 6752. Red filled circles are our RGB bump stars in the present study. Green-filled and open circles are subgiant and turn-off stars, respectively, from Carretta et al. (2005). Literature data are as follow: green diamonds with crosses inside are bright red giants from the extensive study by Yong et al. (2003), and open green triangles are red giant stars from Norris & Da Costa (1995; 6 stars) and Carretta (1994; 4 stars).

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In the text