Fig. 8.
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Spatial variation in the synchrotron spectral index, computed using T–T plots between the (from top to bottom) WMAP9 K-band and Planck PR3 30 GHz, WMAP9 K-band and Planck PR4 30 GHz, WMAP9 K-band and BEYONDPLANCK 30 GHz, and COSMOGLOBEK-band and COSMOGLOBE 30 GHz maps. The spectral index is inverse variance weighted over rotation angle, and in the COSMOGLOBE case also samples.
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