Planck 2013 results
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Fig. 17

image

CMB multipole spectrum residual for the primordial power spectrum test feature. The test feature (top) is set to the anomalously large deviation of the primordial power spectrum reconstruction for λ = 103 in the interval 0.1Mpc-1<k< 0.15Mpc-1, and is zero elsewhere. Bottom: the angular spectrum corresponding to this feature. We observe a large dip at ≈ 1800.

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