an abundance of extragalactic survey data is available to guide the construction of our model and to compare against its output (see the review of Soifer et al. 2008). [*Herschel*]{} will conduct surveys at 250, 350 and 500  with the SPIRE instrument and at 70, 100 and 160 with PACS. Longer-wavelength constraints are available from submillimetre surveys by SCUBA at 450 and 850, and from the MAMBO instrument on the 30-metre IRAM telescope at 1200. The catalogued output flux densities are monochromatic values, with the exception of the [*Spitzer*]{} 24 and 70 MIPS bands for which the modelled spectra were convolved with the MIPS bandpass transmission curves, following the [*Spitzer*]{} Synthetic Photometry Recipe[^2]. This is due to the spectral complexity in the rest-frame 10 region, particularly for the star formation component due to the presence of Polycyclic Aromatic Hydrocarbon (PAH) features.

The format of the output from the infrared extension, as it appears in the $S^{3}$-SEX online database, is described in Appendix A.

Star-forming galaxies
---------------------

The population of star-forming galaxies in W08 comprises two populations, normal (or quiescent) galaxies and starbursts, identified respectively with the low and high-luminosity Schechter function components of the local 1.4 GHz luminosity function of 