Power spectra of Herschel SPIRE maps. The power spectra of the Spider map (d_S) and data noise (d_N) are compared to those of the LH field (d_L) with the dust contribution, s_L, as estimated by Viero et al. (2013). The spectrum of an observation of Neptune (d_PSF), plotted with an arbitrary normalization, indicates the beam attenuation at high k. The wavenumber in abscissa is k = 1/θ. These spectra show that the CIB and noise components dominate the dust signal at the smallest scales in the d_S map.