Map of microwave B-mode polarization for a patch of sky measured by the BICEP2 collaboration. The color represents the magnitude of fluctuations on the scale of ± 0.3 λΚ and the lines display the magnitude and direction of linear polarization.

From the article:

Detection of $B$-Mode Polarization at Degree Angular Scales by BICEP2
P. A. R. Ade et al. (BICEP2 Collaboration)
Phys. Rev. Lett. 112, 241101 (2014)

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