Effect of varying the wind parameter λ on the time evolution of the metallicity Z. The model assumes an exponential infall law with timescale τ = 2 Gyr and infall mass Minf = 1010M⊙, and an SFE S = 1 Gyr-1. In the left panel we show the results of models with a Salpeter (1955) IMF, while in the right panel a Chabrier (2003) IMF is assumed.
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