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Fig. 7.

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Folded phase-averaged spectra from the LE, ME, and HE. The black line shows the background spectrum with systematic errors of 3.5%, 2.0%, and 2.5% for LE, ME, and HE, respectively, based on the Insight-HXMT background models (Liao et al. 2020a,b; Guo et al. 2020). The statistical errors of the background are ignored.
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