Notes. Columns 4 − 6: emissivities (in units of MJy/sr (10²⁰ H atoms)^-1 cm²) computed in ELAIS N1/MIPS at 60, 100 and 160 μm compared to those of the literature. Columns 7, 8: emissivities computed in N1/GBT at 60, 100 μm. Uncertainties are 1σ uncertainties that take into account the statistical variance and the instrumental noise. MAMD 2005 stands for Miville-Deschênes et al. (2005). Their emissivities are for the Spitzer XFLS field. Planck 2011 stands for Planck Collaboration (2011a). Their emissivities are for the ELAIS N1/GBT field. The second last line gives the mean values of the residual maps. At 160 μm, the mean value has been corrected for the offset determined in Sect. 6.1, and gives the level of the CIB (although see Sect. 6 for a more accurate determination). At 100 μm, the mean value is strongly contaminated by residual zodical emission (see Dole et al. 2006) thus does not give the CIB level. The last line gives the CIB coming from the Béthermin et al. (2011) model.