Effective beam window functions (solid lines) for each HFI frequency. The shaded region shows the ± 1σ error envelope. Dashed lines show the effective beam window function for Gaussian beams with FWHM 9.́65, 7.́25, 4.́99, 4.́82, 4.́68, and 4.́32 for 100, 143, 217, 353, 545, and 857 GHz, respectively. We compute the 100 GHz window function to ℓ = 2500, 143 GHz to ℓ = 3000, and the rest to ℓ = 4000.
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