Average mid-IR spectra of AGN galaxies (based on the BPT optical diagnostics) classified as star-forming (SFG) and non-star-forming (NOT-SFG) based on our diagnostic. The AGN galaxies predicted as star-forming galaxies (solid blue line) have similar average spectra with the normal star-forming galaxies (dashed black line). The AGN galaxies that have been predicted as not star-forming (solid blue line) have steeper spectra above 12 μm than the BPT-AGN predicted as star-forming galaxies. In addition, the average spectra of the AGN galaxies identified as non-star-forming exhibit clear emission lines of [Ne V] 14.3 μm (vertical dashed blue line) and [O IV] 25.9 μm (vertical dashed red line). These are tell-tale signs of a strong radiation field source. The shaded area in both average spectra corresponds to the standard deviation of 1σ.