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Fig. 4


Histogram of [Fe/H] ratios for our NGC 1851 stars. For the gaussian curve we adopted as FWHM = 0.024, that is the average standard deviation in [Fe/H] between the mono-metallic GCs M 4 (rms = 0.025) and M 5 (rms = 0.023, see Carretta et al. 2009c).

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