Effect of compression/decompression. At 100 GHz this induces a small noise increase, indicated by the black (with compression-decompression) and green (without) curves, showing the signal (difference between CMB plus noise, with pure noise) for two different noise realizations (NOISE0 and NOISE1). The red curves are the differences between the two noise realizations, which are fully decorrelated, as shown by their difference (blue curve) being higher by a factor of 2. The beam and sub-pixel effects are apparent as a flattening at ℓ > 2000.
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