Fig. 2.
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X-ray spectrum of the pre-burst emission for burst #4. Spectra of other bursts are shown in Fig. A.1. The solid red line represents the total model tbabs*(diskbb+comptt), while the dashed lines represent diskbb and comptt components separately, and the gray points show the data. The pre-burst emission was chosen as a 20 s interval taking place 20 s before the burst.
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