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Fig. 20
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Ratio of He II to H I ionising photons fluxes as a function of age. The dashed (dash-dotted) lines correspond to CSF models in which the advanced phases of evolution are included (not included). In burst models these advanced phases are shown at 2.625 and 2.750 Myr. Blue (orange) lines are for Z = 0.1 (0.001) Z⊙.
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