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Fig. 5.
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Evolution of the (sub)mm wave radio spectral index (α) between ALMA bands 3 and 7 (i.e., 95 GHz vs. 345 GHz). The horizontal gray line points to α = −0.5. The γ-ray light curve is overlaid in the background for comparison. The horizontal blue line denotes the threshold for the γ-ray flare.
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