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Fig. 2.

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Relation between 12+log(O/H) (panel a) and log(N/O) (panel b) and SFR for our sample of SDSS star-forming galaxies. Blue, green, red, cyan, magenta, and yellow solid lines represent the fits to the running median for bins of 1000 objects in six Dn(4000) bins. The number of star-forming galaxies in each Dn(4000) bin appears on the legend. Black dash-dotted lines show the 12+log(O/H) (panel a) and log(N/O) (panel b) vs. SFR fits to the running median for bins of 1000 objects in six log(M/M) bins (each box shows the considered log(M/M) range).

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