Left: /L15 versus [Ne iii]/[Ne ii], as measured from the IRS spectra of the sources in our sample with EW6.2 ≥ 0.4 μm. The orange and blue stars correspond to the average spectra of galaxies with IR8 ≤ 6.0 and 6.0 < IR8 < 9.0, respectively. Leftward arrows denote upper limits of the [Ne iii]/[Ne ii] ratio for sources with only a [Ne ii] detection Right: dust-mass-weighted luminosity (LIR/Mdust) as a function of the hardness of the radiation field traced by the [Ne iii]/[Ne ii] line ratio.
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