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Fig. 3.

Peak ionizing photon fluxes reached by an ageing instantaneous starburst of total mass 106 M⊙ as a function of IMF slope (assuming αm = αu). In each panel, metallicity is indicated by colour while upper mass cut-off Mu is indicated by line style (100 M⊙ = solid, 300 M⊙ = dot-dash).
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