Fig. 10.
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Pseudo-equivalent width of sodium in the Sigma and RV Ori clusters. There is a clear dependence of pEW(Na) on colour. The presence of veiling can affect the measured pEW(Na). Outlier a is likely younger than the rest of the sample because it shows weaker Na equivalent widths and is more overluminous than the rest of the stars in σ Ori with similar colours.
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