a)–c) Differential extragalactic number counts not used for the fit. Black solid line: our best-fit model. Black dashed line: 1-σ range of the model. a) Red diamonds: Elbaz et al. (1999) ISO counts. Green triangle: Gruppioni et al. (2002) ISO counts. Blue squares: Pearson et al. (2010) AKARI counts. Purple cross: Hopwood et al. (2010) AKARI (lensed) counts. Cyan plus: Teplitz et al. (2011)Spitzer/IRS counts. b) Red diamonds: Hacking & Houck (1987), Lonsdale et al. (1990), Rowan-Robinson et al. (1990), Saunders et al. (1990), Gregorich et al. (1995) and Bertin et al. (1997) IRAS counts. c) Red diamonds: Berta et al. (2010)Herschel/PEP counts.