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Fig. 8
Oxygen abundances derived from the two line ratios, N2 and O3N2. The contours trace the highest concentration of data points, with levels at 20 × 103, 40 × 103, 60 × 103, 80 × 103, 100 × 103, and 120 × 103. The histograms are normalized to peak, and in black is shown the one-to-one line.
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