Spatial distribution of the spectral index of polarized thermal dust emission, βd, as estimated with Commander, adopting a smoothing scale of 3° FWHM. Top panel: no Gaussian prior is applied. Bottom panel: a Gaussian prior of βd = 1.60 ± 0.10 is applied. In both cases, the spectral index of synchrotron emission is fixed to βs = −3.1.
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