Fig. 1.
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Evolution of the count rate (a), the centroid frequency (b), and the fractional rms (c) of the type-C QPOs as observed with the three Insight-HXMT instruments. For comparison, the frequencies of type-A QPOs reported by Zhang et al. (2023) are also plotted in panel (b) (magenta triangles). Vertical dashed brown lines demarcate the different states during the main and mini-outbursts.
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