Fig. 16.
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Histogram of [O III]λ5007/[O II]λ3727 for the GSWLC (red) and the VIPERS star-forming (blue) samples. The boundary between the lower and upper branch in the R23 diagnostic from Nagao et al. (2006) is shown as a dashed green line. Most of the galaxies are found on the high-metallicity branch (99.98% for GSWLC and 98% for VIPERS).
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