Fig. 3

a) Ratio between IBIS/ISGRI (20–100 keV) flux and JEM-X (3.04–5.52 keV) flux as a function of time; b) ratio between JEM-X 10.24–25.88 keV flux and 3.04–5.52 keV flux as a function of time; c) ratio between 20–100 keV flux vs. 3.04–5.52 keV flux as a function of 3.04–5.52 keV flux (filled circles) and 20–100 keV flux reduced by a factor of 100 (open circles); d) ratio between 10.24–25.88 keV flux and 3.04–5.52 keV flux as a function of 3.04–5.52 keV (filled circles) and 10.24–25.88 keV flux multiplied by 2 (open circles). In all cases, the adopted time binning is 3 h.
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