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Table 6
Mean oxygen abundance values (denoted by 
) obtained from the two line ratios N2 and O3N2 from all data points, and after correcting for ionization.
| N2all | N2ion | O3N2all | O3N2ion | |
|---|---|---|---|---|
 |
8.47 ± 0.08 | 8.54 ± 0.06 | 8.42 ± 0.01 | 8.48 ± 0.01 |
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