Fits to the observed SED of source z1 (photometry shown by blue symbols, including 3σ upper limits) using different spectral templates: Chary & Elbaz (2001) (black = best-fit template, and magenta = template with maximum IR luminosity), Polletta et al. (2007) (red = global best-fit template, and green = best-fit to visible-near-IR SED excluding the thermal IR), and Michałowski et al. (2010a) (blue). The best-fit SED with the templates of Vega et al. (2008), very similar to the one using Polletta’s templates, is not shown here for simplicity. Left: global visible to sub-mm SED. Right: zoom on visible to near-IR part of the SED including for comparison also the best-fit SED at high-redshift (z = 7.5) from Laporte et al. (2011, dashed line), which is most likely excluded because of our Herschel detections.