Fig. 4.
Best fit values for the synchrotron SED spectral index βs (upper panel) and PTE coefficients (lower panel), obtained by fitting the model of Eq. (2) to S-PASS, WMAP and Planck data. Different point colors and shapes refer to the different sky regions. The black line and gray area in the upper plot show the retrieved average value βs = −3.22 ± 0.08.
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