  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. In this work, we demonstrate the use of the
FF information extracted from three observations of the edge-on spiral galaxy
NGC 891 to measure the rotation of NII and CI gas at Far-infrared frequencies
in complement to radio observations of the HI 21cm line and the CO(1-0)
transition as well as optical measurements of Halpha. We find that measurements
of both NII and CI gas follow a similar velocity profile to that of HI and
Halpha showing a correlation between neutral and ionized regions of the
interstellar medium (ISM) in the disk of NGC 891.
