Pre-continuum-subtracted (top) and post-continuum-subtracted (bottom) spectra of AzTEC-3 extracted from the same region as the spectra (black circle shown in panel 1 of Figure 7 using a fit on the order of 1 and encompassing frequencies up to 300 GHz. The red region represents the 1σ rms of the image and the gray line represents the atmospheric transmission at 1.0 mm PVW. The possible additional [C II] wing feature mentioned in Section 2 can be seen in the 300.5-301 GHz frequency range.