Fig. 1
Top: the PCA soft (2−4 keV) and hard (9−20 keV) X-ray light curves of AM Her, along with the hardness ratios (ratios of 9−20 keV counts to 2−4 keV counts), are shown for ObsId 30007-01-01-00. The vertical lines in the light curves represent the sections used in our cross-correlation study. The cross-correlation functions (CCF) for the first and second sections are displayed in the two top-right panels, respectively. Bottom: similar to the top panel but for ObsId 20010-01-01-030.
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