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We present the [CII] 157.7 micron map of galaxy NGC 7331 obtained withFIFI-LS on SOFIA. This map extends an existent Herschel/PACS observation of thecentral strip of the galaxy to encompass the entire molecular ring and much ofthe disk, including multiple spiral arms with intense far-IR emission. We alsopresent Herschel archival data of the [NII] 205 micron line which covers asubstantial part of the [CII] SOFIA observations and allows us to estimate theneutral fraction of the [CII] emission along the ring and disk of the galaxy.We find that the neutral fraction rises with the distance from the center. Inaddition, by tracing the azimuthal variation of the neutral fraction, we areable to see how our observing perspective affects this measurement. The highinclination of NGC 7331 allows us to glimpse the internal walls of themolecular ring. There, young bright stars emit UV radiation causing more [CII]emission to be produced in the ionized gas. On the outer walls, opaque dustshrouds the rest of the ring, making the neutral medium the dominant source of[CII] emission. Through spatial analysis comparing the [CII] emission totracers of gas heating, we are able to investigate how the photoelectricheating efficiency varies throughout NGC 7331 and extend global measurements ofthe [CII] deficit to local environments. Since the origin of [CII] emission hastypically been studied in face-on galaxies, our results shed a new light on theinterpretation of [CII] emission especially when studying distant galaxies withunknown inclination.

[CII] map of the molecular ring and arms of the spiral galaxy NGC 7331