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Fig. 1.
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Calculation of the variability. We show the 15–150-keV light curve {ri} of GRB 080319B as observed with BAT. The orange line shows the smoothed profile {sf, i} obtained with a smoothing timescale of Tf = 18.43 s, which collects a fraction f = 0.45 of the total fluence of the GRB.
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