Fig. 4

Sequences of models in which t2 is increased from 0.004 to 0.16 by successive factors of 1.58 ( = 0.2 dex). All calculations were carried out with U = 0.01 and the zero-age instantaneous starburst model SED with Msup = 100 M⊙ from M03. Each sequence corresponds to a different metallicity Z, which is indicated in the line color legend in Z⊙ units.
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