Figure 6.5. Upper panel: predicted and observed [C/Fe] versus [Fe/H]. Models from Chiappini et al. (2003a). Lower panel: predicted and observed [N/Fe] versus [Fe/H]. For references to the data see the original paper. The thin and thick continuous lines in both panels represent models with standard nucleosynthesis, as described in the text, whereas the dashed line represents the predictions of a model in which N in massive stars has been considered as a primary element with "ad-hoc" stellar yields.
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