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Fig. 18

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Metallicity as a function of the gas fraction for the inner/outer galaxy regions. Blue squares show the inner regions, while red squares show the outer regions. Blue and purple solid lines show models with outflows and inflows of pristine gas. The dotted black line shows the closed-box model. Dash-dotted red and magenta lines show models with enriched inflows (with the same metallicity as the galaxy) and no outflows.

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