Spectra of NGC 6781 over the complete PACS/SPIRE spectral coverage (51−672 μm) extracted from the PACS central spaxel and the SPIRE central bolometers, taken at the “center” of the nebula (black line) and on the eastern “rim” (gray line). The range of each spectral band is indicated by a horizontal bar near the bottom edge of the plot. The flux units are set to be those of the surface brightness (mJy arcsec^-2) at the specific position in the nebula. Various ionic, atomic, and molecular lines are detected and labeled as identified.