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Fig. A.2


Time evolution computed with Rebetiko of a) the Lick index HδF, b) LyC photon rate per unit mass and c) Hα emission-line equivalent width for an instantaneous burst (orange) and continuous star formation at constant SFR (red). The vertical blue strips on top of the panels mark the SSP ages for five stellar metallicities included in the fado-optimized library Base , which was compiled such as to simultaneously yield an adequate coverage of steep decline in the LyC photon rate in the first ~40 Myr and the significant evolution of EWs of stellar absorption features (e.g., the HδF Lick index) over the ensuing ~1 Gyr in the evolution of an instantaneously formed stellar population. The SSP ages in Base (green filled circles) are included for comparison.

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