Fig. 5
Simulated cumulative distributions (10 000 trials) of the variability index V versus fraction of trials, or probability. Solid black: mean flux 131 × 10-8 photons cm-2 s-1 and square root of variance 33.8 × 10-8 photons cm-2 s-1 for E ≥ 100 MeV; dotted red: mean flux 60 × 10-8 photons cm-2 s-1 and square root of variance 15.5 × 10-8 photons cm-2 s-1 for E ≥ 100 MeV; dashed green: mean flux 33 × 10-8 photons cm-2 s-1 and square root of variance 8.5 × 10-8 photons cm-2 s-1 for E ≥ 400 MeV; dot-dahsed blue: mean flux 17 × 10-8 photons cm-2 s-1 and square root of variance 4.4 × 10-8 photons cm-2 s-1 for E ≥ 400 MeV. The vertical lines indicate the observed values of V and the associated probability for the corresponding dataset (Table 2).
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