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Fig. 2.

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Pulse profile map normalised to the range of 0−1 for all Insight-HXMT observations of the 2018 outburst, sorted by ObsID number (in ascending order of flux). This figure illustrates the flux dependence of the pulse profiles in the LE (the left panel), ME (the middle panel), and HE (the right panel) energy bands. The dashed red lines indicate the two flux levels (ObsID ∼ 9 and 17) where the profile shape changes.

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