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Fig. 2.


Broadband radio spectra (2.64 GHz–43 GHz) over the period of interest. The spectral evolution is indicated by the line color which changes from dark blue to light green as time moves forward. Each line corresponds to one broadband spectrum obtained within ∼40 min, and hence should not be affected by intrinsic source variability which is expected to be much larger. The average time interval between two consecutive spectra is ten days.

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