Planck 2018 results
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Fig. 18.


Same as Fig. 17, but for the curl reconstruction. Here the lower panel shows the curl amplitude over the conservative multipole range (8 ≤ L ≤ 400; blue) and over the range covering the negative curl feature shown in Fig. 16 (264 ≤ L ≤ 901; orange). We use the same binning scheme as for the lensing gradient (Eq. (10)), with an amplitude of unity corresponding to a flat curl spectrum.

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