Planck 2015 results
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Fig. 4


Top: TT plot of the free-free amplitude at 22.8 GHz against the Hα intensity [R] in the Gum Nebula (see Fig. 5 for the location of the region). Bottom: TT plot for 85% of the sky. Regions that show large dust absorption have been masked out, mostly within | b | ≲ 7deg.

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

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