Fig. 1
Halo metallicity distribution function of the two-infall (left panel, solid) and two-infall + outflow model (right panel, solid) compared with the observational data from Ryan & Norris (1991) (dashed) and Schörck et al. (2009) (HES) (dotted). Theoretical predictions have been smoothed by a Gaussian function with a variance equal to the data error of 0.2 dex.
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