Planck 2015 results
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Fig. 9


Reduced χ2 statistics for simulated full-mission 30-GHz data. The initial resolution of the noise covariance matrix is varied from Nside = 16 to 64 (220 to 55). In all cases the covariance matrix is eventually downgraded to resolution Nside = 16 and compared against simulated maps at this resolution.

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