Illustration of the diversity of spectral components of the 12.7 µm AIB complex and their behavior. Profiles are normalized to the peak specific surface brightness between 12.55 µm and 12.8 µm. The short vertical black lines indicate the positions of unresolved lines, with their assignments given in the top panel. The vertical red lines are placed at potential peak wavelengths of the components. Within each panel, the red and blue spectra represent, respectively, the largest and smallest ratios of local peak surface brightnesses of the components that are marked in red in the gray-shaded subregion. We show the same black spectrum, extracted from a single spaxel, in all panels for comparison.