Discrete cross-correlation function between γ rays and 37 GHz flux. The red, green, and blue dotted lines indicate a significance level of 1, 2, and 3σ, respectively.The horizontal dashed line indicates the zero level of the DCF. The vertical dashed line indicates the peak position of a Gaussian fit to the correlation curve at 56 days. The Gaussian fit we performed on the DCF is indicated by the shaded gray line.
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