Online Material

Table 1: SED-fitting results.

Table 2: Rest-frame 60 $\mu$ m luminosity function in the GOODS-N.

Table 3: Rest-frame 90 $\mu$ m luminosity function in the GOODS-N.

Table 4: Total IR luminosity function in the GOODS-N.

$\begin{figure} \par\includegraphics[width=10.1cm,height=5.6cm]{14608fg5.eps} \end{figure}$	Figure 5: Template SEDs of a Starburst (M 82: cyan dot-dashed line), a Seyfert 2 (red dot-dot-dot-dashed) and a Sdm galaxy (green dashed) from the Polletta et al. (2007) library, normalised to the B-band flux.
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$\begin{figure} \par\includegraphics[width=9.5cm,height=6cm,clip]{14608fg6.eps} \end{figure}$	Figure 6: Rest-frame observed SEDs of the PEP 100- and 160- $\mu$ m sources fitted by the Polletta et al. (2007) Seyfert 2 template (orange dashed line) with underestimated FIR. The red solid line shows the new ``FIR Seyfert 2'' template obtained by averaging the observed data in wavelength bins.
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$\begin{figure} \par\includegraphics[width=10.4cm,height=6.5cm]{14608fg7.eps} \end{figure}$

Figure 7:

160- $\mu$ m/100- $\mu$ m flux ratio versus z both observed for the differently classified PEP 160- $\mu$ m sources (symbols) and derived from the characteristic templates (curves): green circles and dashed line represent the normal galaxy population; cyan stars and dot-dashed line are for SB; red triangles and dot-dot-dot-dashed line are for AGN2; magenta squares and dotted line are for composite objects; blue triangles and long-dashed line are for AGN1. The upward arrows are for sources not detected at 100 $\mu$ m (for which the 3 mJy flux limit has been considered).

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