Differential number counts in the three PACS bands, normalized to the Euclidean slope (dN/dS ∝ S^-2.5). Filled/open symbols belong to flux bins above/below the 80% completeness limit. Models belong to Lagache et al. (2004), Franceschini et al. (2010), Rowan-Robinson (2009), Le Borgne et al. (2009), Valiante et al. (2009), Lacey et al. (2010), Béthermin et al. (2011), Marsden et al. (2010), Gruppioni et al. (2011), Niemi et al. (in prep.). Shaded areas represent ISO and Spitzer data (Rodighiero & Franceschini 2004; Héraudeau et al. 2004; Béthermin et al. 2010a); hatched areas belong to Spitzer 24 μm stacking (Béthermin et al. 2010a). Left and right panels present individual fields and averaged counts, respectively.