Fig. 1
From top to bottom: a) evolution of the flux density of image A; b) evolution of flux-density of image B; c) flux-density ratio (A/B); and d) spectral index of image A. The dotted lines mark local maxima in the evolution of the flux-density ratio at 15 GHz. The continuum lines are our model to the data (the 8.4 GHz model is derived from that at 15 GHz by an opacity correction with Eq. (3), see text).
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