Planck 2015 results
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Fig. 5


Modal reconstruction for the WMAP-9 bispectrum (left) and the Planck SMICA 2015 T-only bispectrum (right) plotted for the domain ≤ 450, using identical isosurface levels. Here, we employed the full 2001 eigenmodes for both the Planck analysis at max = 2000 and for WMAP-9 analysis at max = 600, but for comparison purposes we have only used the first 600 eigenmodes in order to obtain a comparable resolution. The main features in the WMAP-9 bispectrum have counterparts in the Planck version, revealing an oscillatory pattern in the central region, as well as features on the tetrapyd surface. The WMAP-9 bispectrum has a much larger noise signal beyond = 350 than the more sensitive Planck experiment, leading to apparent residuals in this region.

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