Fig. 2
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CRE spectral index as a function of the galactocentric radius. The left panel shows the simulation results using the measured diffusion coefficient from Heesen et al. (2019) and the right panel uses the best-fit value from Mulcahy et al. (2016). The model parameters are shown in Table 1. Green points indicate simulations without advection and blue point show those with advection. The data are taken from Heesen et al. (2019).
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