Fig. 4.
Left: relation between the S34 parameter as calculated with H I 12.37 μm and the total oxygen abundance for the subset of models with log(N/O) = −0.625 dex. Right: relation between the S3S4 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 S34 and S3S4, respectively (purple circles: dwarf galaxies; red triangles: nearby starbursts; green squares: local LIRGs).
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