tokens: (top), central detectors of sparse observations (middle), and from mapping observations (bottom) are shown in blue, orange, and violet, respectively. Lines found by the FF employ round markers while those found by the low SNR search routine through line identification use triangular markers (see Section 3.1 ). The |SNR| cutoff in each case is shown by the dotted black line. The axes in each case have been set to the same scale to allow comparison. 5 CONCLUSIONS The extensions of the FF to include spectral observations from off-axis detectors in sparsely sampled single-pointing observations is detailed. An additional 30 720 spectral features with a |SNR| greater than 6.5 are aggregated into the SAFECAT by the inclusion of the analysis and extraction of features from the off-axis detector spectra. We developed a set of postcards to highlight and summarize results from these off-axis detectors in each observation that are of a similar format to the mapping postcards described by Paper I and are available from the ESA Herschel legacy area (see footnote 6). We have also extended the automated SPIRE FF routine ( Paper I ) to identify the atomic or molecular transition that corresponds to the features extracted from HR observations of the SPIRE FTS. This identification of atomic/molecular transitions is done by matching the spectral features to a template of 307 atomic fine structure and molecular features that are commonly found in SPIRE FTS observations. Line identification is reliant on the radial velocity estimates included in the catalogue by Paper II and is able to successfully match 77.3 per cent, 93.1 per cent, and 95.2 per cent of spectral features found by the FF from central detectors of sparse single-pointing observations, off-axis detectors, and mapping observations, respectively, to their atomic/molecular transitions. We find this line identification to be particularly effective at identifying the CO rotational ladder from J = 4–3 to J = 13–12 and the [N ii ] 3 P 1 – 3 P 0 transition in SPIRE FTS observations. The identification of all 15 atomic/molecular species in SPIRE FTS spectra from mapping, off-axis detectors in sparse observations, and central detectors in sparse observations is shown in Fig. 14 . Note that isotopologues and ionization states have all been grouped together for each species. Figure 14. The line identification of all 15 atomic/molecular species contained in the template for mapping and sparse SPIRE observations. The information provided by the line identification is also used to uncover low SNR features that fall below the |SNR| ≥ 5 cutoff that exists nominally in the FF ( Paper I ). This low SNR search routine adds an additional 1516 for the central detectors of sparsely sampled single-pointing observations and 1234 for the off-axis detectors. An additional 370 lines are added by this routine from mapping observations of the SPIRE FTS. APPENDIX: LINE MATCHING TEMPLATE A note on the quantum numbers
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