Fig. 8.
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Average mid-IR spectra of composite galaxies (based on the BPT optical diagnostics) classified as star-forming (SFG) and non-star-forming (NOT-SFG) based on our diagnostic. The composite galaxies predicted as star-forming galaxies (solid blue line) have similar average spectra with the typical MS star-forming galaxies (dashed black line). The composite galaxies predicted as not star-forming (solid blue line) have steeper spectra above 12 μm. The shaded area in both average spectra corresponds to the standard deviation of 1σ.
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