Noise map σY500(θ500) for θ500 = 6arcmin. The PSZ is limited by instrumental noise at high (| b | > 20deg) Galactic latitude (deeper at ecliptic poles) and foreground noise at low Galactic latitude. The scale of the map ranges from 0.5 to 2 times the mean noise of the map, which is ⟨ σY500(6arcmin) ⟩ = 2.2 × 10-4 arcmin2.
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