Planck 2015 results
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Fig. 15


Local spectral index of the synchrotron emission β(ν) = dlnT/ dlnν vs. frequency for a sample of pixels (one per Nside = 8 super-pixel), in the GALPROPz10LMPD_SUNfE model from Orlando & Strong (2013). The spectra are colour-coded by Galactic latitude: spectra at low latitudes show strong low-frequency curvature due to free-free absorption.

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