Fig. 5
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Swift-XRT dataset representation after energy bin grouping to avoid background spectra dominated by zeros. (a) Swift-XRT image of OP 313. Blue circle and orange annulus show the signal and background extraction regions, respectively. (b) Distribution of events for both regions as a function of energy, corrected for the different region sizes. (c) Swift-XRT exposure (effective area × livetime) as a function of true energy. (d) Swift-XRT energy dispersion matrix (also known as redistribution matrix or migration matrix).
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