Larger version of Fig. 2. Top: HIFI spectral scan of Orion KL in Band 4b. Bottom: HIFI spectral scan of Orion KL in Band 1a. Strong lines in both spectra are identified. At the bottom of each panel we give the continuum level seen in the data at the ends of the bands. We made use of the myXCLASS program (http://www.astro.uni-koeln.de/projects/schilke/XCLASS) which accesses the CDMS (Müller et al. 2005,2001, http://www.cdms.de) and JPL (Pickett et al. 1998, http://spec.jpl.nasa.gov) molecular data bases for line assignment.