Planck 2018 results
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Fig. 24.

image

Base-ΛCDM model (AL = 1) TT power spectrum residuals smoothed with a Gaussian kernel of width σ = 40. The black line shows the smoothed difference between the coadded data points and the theoretical model for the Planck TT+lowE best-fit model, while coloured lines show the residuals for samples over the allowed parameter space coloured by the value of Ωmh2. Grey bands show the 1, 2, and 3σ diagonal range expected for the smoothed residuals in the best-fit model. The red dashed line shows 10% of the lensing-smoothing difference predicted in the best-fit model, displaying the oscillatory signal expected if there were more lensing of the acoustic peaks. The data residuals are not particularly anomalous, but the residuals have a similar pattern to the lensing smoothing difference over the approximate range  = 1100–2000, giving a preference for around 10% more lensing at fixed cosmological parameters. Allowed models with lower Ωmh2 (and hence higher H0) predict less lensing and give a larger oscillatory residual, preferring relatively more lensing smoothing than models with high matter density. The black dashed line shows the smoothed residual for the Planck TT+lowE best fit to ΛCDM+AL (with AL = 1.19).

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