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Published online by Cambridge University Press: 03 August 2017
The contributions to the far infrared spectra of galaxies of the ‘cool’ cirrus and ‘warm’ starburst components are reviewed, together with the complications introduced by dust in the narrow-line regions of Seyferts, the destruction of very small grains, and the small percentage of galaxies which are optically thick in the optical band. The role of interactions and mergers in generating ultraluminous infrared galaxies is reviewed.