Power spectrum (black) estimated with the NILC method (Planck Collaboration XII 2014), with 1σ Fisher errors (grey shaded). The Planck Λ CDM best fit model, including solely the Sachs–Wolfe (SW) effect, is shown in blue. The red curve for umin ≠ 0, andthe dashed curve for umin = 0, also based solely on SW, are optimized based on the best fit to C(cos θ) shown in Fig. 2. The SW effect dominates at large angles ≫ 1– 2∘ , corresponding to ℓ ≲ 30, while local physical effects, e.g. BAO, dominate for ℓ ≳ 30.
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