Fig. 2
Top: 5.5 GHz (blue) and H band (red) light curves. Bottom: light curve of the 5.5−9 GHz spectral index. A positive spectral index corresponds to an inverted spectrum that is generally characteristic of an optically thick synchrotron emission from a stratified jet (e.g., Blandford & Königl 1979). The dates of the five Suzaku observations are indicated by the vertical dotted lines (data from Corbel et al. 2013).
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