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Fig. 4

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Evolution of both slimbh and kerrbb2 spin estimates vs. luminosity and time for all Insight-HXMT observations below 1 LEdd. The dips around 0.55 LEdd and 0.49 LEdd correspond to the rise in inner disk radius and ƒsc between MID 59445–59460 and 59469–59472. Both kerrbb2 and slimbh give stable spin values up to ~0.9 LEdd.

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