Average templates of Fig. 9, scaled to the mean L_bolo of each sub-sample. The highest-L_bolo template is shown three times, at the original scale (solid blue line) and multiplied by arbitrary factors (solid green and red lines). Also shown are two templates at different redshifts from Smith et al. (2012a), three CSEDs from Andrews et al. (2017), and the Spi4 template of Polletta et al. (2007). The SEDs from the literature have been normalised to the stellar luminosity of the highest-L_bolo template.