Evolution of Starburst99 age indicators, shown for Z = 0.02. The upper abscissa represents the stellar lifetime at the corresponding SSP age. Hα is indicated in red, Brγ green, CO 2.3 μ purple, and CaT blue. The CO EW values where typical SN II progenitors (MZAMS ≈ 8–16 M⊙) are expected to be found are encompassed within the purple shaded area.
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