Fig. 10.
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Posterior mean (left panel) and standard deviation (right panel) maps of the spectral index of polarized synchrotron emission. We note that a prior of βs = −3.3 ± 0.1 is applied to all four regions, but only the Galactic Spur and Galactic Plane regions are constrained with data through the likelihood. See Sect. 5.3.2 for further discussion.
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