Fig. 7.
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Radio spectral index as a function of the SFR surface density 
. Data points are coloured according to the radius of the star-forming disc r⋆. The radio spectral index depends only weakly on ΣSFR but significantly on r⋆ (compare with Fig. 5b). This is in agreement with the escape of CREs by advection in a wind (see Eq. (13)).
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