Euclidean-normalized differential number counts of extragalactic sources at 70 μm compared with our model fit. The blue open circles are from Berta et al. (2011), black triangles from Bethermin et al. 2010). Other datapoints are as reported in AF2010. The cyan short-dashed line is the LIRG and the red long-dashed line the ULIRG populations. Black dotted and green dot-dash lines are the normal spiral and type-1 AGN sources (see Sect. 3 for our population decomposition).