Fig. A.2.
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Stacked spectrum (in black line) for galaxies with 1 and 4/5 SFEs, in the upper and bottom panels, respectively. The background spectra correspond to the galaxies used for the stacking (∼35 galaxies for each sample). The 1σ lines correspond to the standard deviation of the stacked spectrum. The stacked spectra was retrieved using Specstack (Thomas 2019).
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