Planck 2018 results
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Fig. 15.


Acoustic peak re-sharpening after delensing of the SMICA CMB maps. From top to bottom: difference between the delensed and original TT, TE, and EE spectra. Data points show delensing with our internal, minimum-variance, quadratic lensing estimate (blue), with the GNILC CIB map (orange), and with their optimal combination (green), as described in the text. For reference, the black line shows half the difference of the unlensed to lensed CMB spectra in the fiducial cosmology. In all cases, the solid coloured lines show the FFP10 simulation predictions, obtained after performing the same operations on each simulation as for the data. The dashed lines show the noise delensing bias defined by Eq. (55) (only relevant here for EE at high multipoles), while the dot-dashed lines show the CMB peak smoothing caused by the tracer reconstruction noise, Eq. (56).

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