MAGPHYS best-fit spectral energy distributions (SEDs) of the interacting pair close (in projection) to 3C 318. Top: the East galaxy. Bottom: the West galaxy. The observed (Spitzer and SDSS) photometry is listed in Table 1, and plotted with red circles. The blue and black solid lines, respectively, correspond to the unattenuated and attenuated best-fit SEDs. Green circles represent the photometry at the three shortest Herschel bands, estimated using the computed infrared luminosity ratio and the measured integrated Herschel flux density (see text).