Best-fit SEDs for candidates with available constraints at 24 μm: z1 and Y7 (sources clearly detected, top row), Y8 (source highly contaminated, middle left panel), and Y3, Y4, and J1 (non-detection, 1σ flux  <  38.7 μJy). Different spectral templates are displayed. Green (pink) lines show the best-fit solutions at z > 7 using our standard templates based on Bruzual & Charlot models without (with) nebular lines. Black and red lines show the best-fits at low redshift (z < 4) using the templates from the GRASIL models (Silva et al. 1998) and the SWIRE starburst-AGN templates of Polletta et al. (2008), respectively. Blue lines show best-fit solutions using the empirical LIRG–ULIRG templates of Rieke et al. (2009).