Fig. 9.
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Metallicity calculated using N2O2, R23, and O3N2 diagnostics. The specific radial zones evaluated were 0–10 kpc (ellipse A), 10–20 kpc (ellipse B), and 20–25 kpc (ellipse C). The overall metallicity values calculated with N2O2 and R23 agree well, with the O3N2 metallicity offset to a lower value. None of the three indicators shows a strong metallicity gradient.
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