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We have selected a large sample of star-forming galaxies (104,088) from SDSS-DR4 to derive oxygen abundance calibrations using equivalent width (EW) ratios of three metallicity-sensitive emission-line ratios: [Nii]/Hα, ([Oiii]/Hβ)/([Nii]/Hα), and [Nii]/[Sii]. The analytic calibrations of 12+log(O/H) versus these line-ratios have been obtained as third-order polynomial fits, appropriate for metal-rich...
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