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Fig. 8.
Comparison of C III, N III, and O II lines in the MBO2 (solid blue) and MBO3 (solid black) spectra. The carbon, nitrogen and oxygen abundances in the overplotted best-fitting model of MBO2 (dotted red) are lower compared to those of MBO3 (dotted green) by a factor of two, four, and three, respectively.
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