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Fig. 4.

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Abundances in number fraction respect to iron (and to the solar abundances). The prediction of our model is shown by the red line, while the points are the observations for 5 of the iHe-sdOB taken from Dorsch et al. (2019, 2020, 2021). Different symbols correspond to different stars as indicated in the plot. The black symbols correspond to the abundances of EC 22536−5304. Upper limits are marked by horizontal lines with arrows pointing down. Solar values are taken from Asplund et al. (2009).

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