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We provide a detailed description of the Herschel-SPIRE Fourier TransformSpectrometer (FTS) Spectral Feature Finder (FF). The FF is an automated processdesigned to extract significant spectral features from SPIRE FTS data products.Optimising the number of features found in SPIRE-FTS spectra is challenging.The wide SPIRE-FTS frequency range (447-1568 GHz) leads to many molecularspecies and atomic fine structure lines falling within the observed bands. Asthe best spectral resolution of the SPIRE-FTS is ~1.2 GHz, there can besignificant line blending, depending on the source type. In order to find, bothefficiently and reliably, features in spectra associated with a wide range ofsources, the FF iteratively searches for peaks over a number of signal-to-noiseratio (SNR) thresholds. For each threshold, newly identified features arerigorously checked before being added to the fitting model. At the end of eachiteration, the FF simultaneously fits the continuum and features found, withthe resulting residual spectrum used in the next iteration. The final FFproducts report the frequency of the features found and the associated SNRs.Line flux determination is not included as part of the FF products, asextracting reliable line flux from SPIRE-FTS data is a complex process thatrequires careful evaluation and analysis of the spectra on a case-by-casebasis. The FF results are 100% complete for features with SNR greater than 10and 50-70% complete at SNR of 5. The FF code and all FF products are publiclyavailable via the Herschel Science Archive.

The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder I. The Spectral Feature Finder and Catalogue