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Fig. 4

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N++ ratios between different multiplets plotted against the ionization degree. The value N++ (CELs ratio) corresponds to N++ computed from the relation (N++/H+)ORLs = (N+/O+)CELs × (O++/H+)ORLs. Evidently, the dispersion of the values obtained from different multiplets of N++ is very large, but some trends seem to be present and are discussed in the text.

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