Fig. 5.
Left: relation between the N23 parameter derived with H I 12.37 μm and the total oxygen abundance at a fixed N/O abundance of −0.625 dex. Right: relation between the N3N2 parameter and log U. O/H and log U derived with HCM for the optical lines in a sample of local star-forming galaxies are compared with the IR parameters N23 and N2N3, respectively (purple circles: dwarf galaxies; red triangles: nearby starbursts; green squares: local LIRGs).
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