Planck 2018 results
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Fig. 26.


Comparison of reconstruction band powers for various methods to remove the N(1) lensing bias. Our baseline band powers are built by subtracting the bias calculated analytically with the FFP10 fiducial model, and are shown as the blue points with error bars. The curves labelled “RD-N(1)” and “xpRD-N(1)” invert Eqs. (78) and (79), respectively, and make no assumption about the theory lensing spectrum. The curves labelled “MC-N(1)” subtract a simulation-based estimate of N(1). For comparison the red lines show the band powers without any N(1) subtraction, and the dashed black lines the N(1) bias itself. The top plot shows the lensing reconstruction from temperature only, and is normalized to the FFP10 fiducial . The lower plot shows the temperature-only curl reconstruction (which on small scales appears to be coincidentally close to the result one would expect with no N(1) at all).

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