Fig. 1.
Upper panel: [Ca/H] ratios as a function of [Mg/H] for the field stars in the sample of Gratton et al. (2003). The linear fit to the data we used to rectify the [Ca/H] values is superimposed. Lower panel: same as in the upper panel. The mean values and rms scatter of GCs in our golden and silver samples are superimposed (see text).
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