Table 3
Utilized models.
| Model | Energy bands |
|---|---|
| Ml: constant×TBabs×Smedge×(simpl⊛diskbb) | 2–10 keV (LE), 10–30 keV (ME) |
| M2: constant×TBabs×Smedge×(Thcomp⊛diskbb) | 2–10 keV (LE), 10–30 keV (ME) |
| M3: constant×TBabs×Smedge×(Thcomp⊛kerrbb2) | 2–10 keV (LE), 10–30 keV (ME) |
| M4: constant×TBabs×Smedge×(Thcomp⊛slimbh) | 2–8 keV (LE), 10–30 keV (ME) |
| M5: TBabs×edge×Smedge×slimbh | 2–9 keV (NICER) |
Notes. Spectral fitting with models M1–M2 were performed with Insight-HXMT. Spin extraction with Models M3–M5 utilized both Insight-HXMT (M3-M4) and NICER (M5). Because all of the ‘golden’ observations of Insight-HXMT selected for spin measurement suffered from the photoelectric effect between 8–10 keV, we have restricted LE to 2–8 keV during the final spin estimate (M4). This was also done in the case of M1 & M2 when measuring the spectral evolution on these observations.
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