The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature
  Finder III. Line Identification and Off-Axis Spectra
  The ESA Herschel Spectral and Photometric Imaging Receiver (SPIRE) Fourier
Transform Spectrometer (FTS) Spectral Feature Finder (FF) project is an
automated spectral feature fitting routine developed within the SPIRE
instrument team to extract all prominent spectral features from all publicly
available SPIRE FTS observations. We present the extension of the FF to include
the off-axis detectors of the FTS in sparsely sampled single-pointing
observations, the results of which have been ingested into the catalogue. We
also present the results from an automated routine for identifications of the
atomic/molecular transitions that correspond to the spectral features extracted
by the FF. We use a template of 307 atomic fine structure and molecular lines
that are commonly found in SPIRE FTS spectra for the cross-match. The routine
makes use of information provided by the line identification to search for low
signal-to-noise ratio features that have been excluded or missed by the
iterative FF. In total, the atomic/molecular transitions of 178,942 lines are
identified (corresponding to 83% of the entire FF catalogue), and an additional
33,840 spectral lines associated with missing features from SPIRE FTS
observations are added to the FF catalogue.
