Fig. 2.
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HID of Cygnus X-1 using the data from three proposals: P0101315, P0201012, and P0305079, that are denoted by cyan, orange, and green, respectively. The intensity is defined by the photon count rate of LE ranging from 1 to 10 keV. We define the hardness as the ratio of the raw photon count rate between the 5−10 keV band and the 1−5 keV band. The time resolution is set to 60 s.
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