Fig. 2.
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HID of the 4U 1730–22 2021 and 2022 outbursts from NICER observations. The gray (brown) dots represent the outburst observed in 2021 (2022). All bursts have been removed, and each point represents a segment of 64 s. The HID of the persistent emission before each NICER X-ray burst are marked as black diamond points. The blue diamond points represent the Insight-HXMT bursts. The circle indicates the evolution direction of HID over time.
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