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Fig. 13

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Scatter plot of the spectral index versus the time delay parameter α of spikes selected with various criteria. In each panel, positive α values refer to high-energy delayed events while negative ones refer to low-energy delayed spikes. These two populations are separated by the vertical dashed line, and the number of the spikes, and the mean count spectral index Γ and its standard deviation of each population are also marked in each panel.

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