Planck early results
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Fig.3

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Spectrum of one pixel in the non-molecular region: crosses, total brightness Itot; triangles, average brightness Iref within the reference 48′ × 48′ window (seen on the 3000 GHz panel of Fig. 1); squares, Itot − Iref; and diamonds, CIB spectrum at the central frequency of the HFI filters from 857 to 217 GHz, from Fixsen et al. (1998).

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