IR8 = /L8 μm ratio as a function of L8 μm for star-forming galaxies, excluding recognized X-ray/optical AGN and infrared power-law AGN. The plain and dashed horizontal lines show the center and width of the Gaussian distribution of main sequence galaxies (Fig. 9 and Eq. (5)). Upper panel: position of the star-forming galaxies as measured. Most fall on the same sequence as local star-forming galaxies. Bottom panel: position of the same galaxies after correcting their IR8 ratio for starburstiness (unless 0.5 ≤ RSB ≤ 2, where RSB is consistent with unity within the error bars).
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