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Same as Fig. 3, but now the observational data are binned in time. The black sold line represents the mean pEW within each time bin, while the dashed blue lines indicate the standard deviation. Together with the four distinct metallicity models (Dessart et al. 2013 shown in solid red lines) we also present spectral series produced from two additional solar metallicity progenitors, but with distinct mixing length prescriptions, leading to smaller (mlt3, shown as the dotted red line) and larger (mlt1, shown as the dashed red line) RSG progenitor radii (see Sect. 2.3 for more details).
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