Fig. 6.
Relation between the IR O3N2 parameter defined in this work and the total oxygen abundance (left panel) or log U (right panel) for the models at fixed log(N/O) = −0.625 dex. O/H and log U derived with HCM for the optical lines in our sample of local star-forming galaxies (purple circles: dwarf galaxies; red triangles: nearby starbursts; green squares: local LIRGs) and the sample of galaxies at high-z (orange squares) compiled for this work (see Table 1).
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