Fig. 5

Halo metallicity distribution function of the two-infall + outflow model with case I IMF (left panel, solid) and case II IMF (right panel, solid). Observational data are taken from Ryan & Norris (1991, dashed) and Schörck et al. (2009, HES) (dotted). The theoretical prediction has been smoothed by a Gaussian function with a variance equal to the data error, 0.2 dex.
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