Fig. 21.
Free-form Bayesian reconstruction of the primordial power spectrum for varying numbers of knots (Sect. 6.2.1) using TT,TE,EE+lowE+lensing. The amplitude and tilt are consistent with the rest of the results with the same combination of likelihoods. As more knots are added, the ℓ ≃ 30 feature in the Cℓ temperature spectrum is visible as a dip to lower power.
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