Planck 2013 results
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Fig. 3


Differences between power spectra evaluated from the union masks G22PSA82 and G35PSA82 ( mask0 and mask1 respectively in the legend), showing the presence of Galactic dust. For ≤ 1400 the spectra show the 217143 “double-differenced” power spectrum, rescaled to correct for dust emission at 143 GHz. For  > 1400 the 217 mask differenced power spectrum is plotted. The blue line shows the 857 GHz mask-differenced power spectrum scaled to 217 GHz as described in the text. The green dotted line shows the best-fit of Eq. (9) scaled to 217 GHz. This is the model that we use to subtract dust emission at high multipoles from the 143 × 143, 143 × 217 and 217 × 217 spectra with suitably adjusted scaling factors.

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