Planck 2013 results
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Fig. 12

image

Correlation between the 143 and 857  GHz frequency maps on 28% of the sky (Hi column density smoothed at 1° lower than 3 × 1020 cm-2). CMB anisotropies have been removed at 143  GHz. Left: raw correlation. Right: correlation after a residual solar dipole has been removed at 143  GHz. The offset of this correlation sets the Galactic zero level of the 143  GHz map.

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