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Fig. 2.

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Synthetic stellar population spectra between 1 and 200 eV for different population ages. The spectra are calculated with STARBURST99 (Leitherer et al. 2014) using the Padova AGB evolution tracks with solar metallicity and Kroupa (2001) IMF. The black line shows the PWPL reconstructed spectrum for a population age of 10 Myr.
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