Power spectrum residuals between the summed cross-spectra at three HFI frequencies. The top panel shows 100 × 100–143 × 143, the middle panel shows 100 × 100–217 × 217 and the bottom panel shows 143 × 143–217 × 217. A “best fit” model for unresolved foregrounds has been subtracted from the power spectrum at each frequency. The scatter in the multipole range 50 ≤ ℓ ≤ 500 is listed in each panel.