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Fig. 2.
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GRB 221009A 200 − 1200 keV PICsIT light curve with the corresponding hardness ratio HR = (200 − 312 keV)/(570 − 1200 keV), normalization at 300 keV (ph cm−2 s−1 keV−1), and photon index to power-law fits. The black dashed line denotes HR = 0.5 for reference, and the red dashed line is at an index of 1.75 for reference.
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