Planck 2013 results
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Fig. 11


Null-test results comparing power spectra from survey difference maps (SS) to those from half-ring difference maps (h). Some excess at low multipoles is clearly visible at 30 GHz (left), where the main source has been identified as sidelobe pickup. At 44 (centre) and 70 GHz (right), there is less low- contribution both in TT and in EE, although residuals are still present. For multipoles larger than few tens, null-test EE spectra follow the expected level of noise as traced by half-ring differences.

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