Planck early results
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Fig.10

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Hit count (left) and noise maps (right) at 30GHz (top), 44GHz (middle), and 70GHz (bottom). The complex distribution around the ecliptic poles in the 44GHz hit map is caused by the location of 44GHz horns on the focal plane. The noise maps are derived from half-ring jackknife tests described in the text.

This figure is made of several images, please see below:

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