Fig. 5.

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Hardness ratio plots between the soft (S; 2.0−4.0 keV) and hard (H; 12.0−20.0 keV) energy bands for the low (red), mid (green), and high (blue) intensity levels. The inset in the upper right corner shows that the hardness ratio in the low-intensity level rises slowly compared to the high-intensity level in the phase range 0.4−0.6.
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