Spectra of NGC 6781 over the complete SPIRE spectral coverage (194−672 μm) at 16 distinct positions, where the SSW and SLW bolometers spatially overlap reasonably well. Bolometer positions are nested between the two pointings, and spectra extracted from the center pointing are shown in black and those from the rim pointing are shown in dark gray. The background PACS 70 μm image indicates the approximate locations of the corresponding bolometers within the nebula. The flux units are set to the surface brightness (mJy arcsec^-2). The measurements are valid roughly within the central 30′′ of the specific location of the bolometers. The spatial variation of the strength of the CO rotational transition lines and thermal dust continuum is clearly detected.