Fig. 9.
Distribution of difference of the oxygen abundance derived with O3N2 and R calibrations for SQ HII regions. The grey dashed line indicates a difference equal to zero, and the red dashed line corresponds to the mean oxygen abundance difference between O3N2 and R calibrators (0.02 dex) for SQ HII regions; grey dotted lines indicate the 3σ rms. The dashed histogram represents the sample of SQ HII regions when 12+log(O/H) < 8.4, for which the R calibrator was adopted.
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