Fig. 1.
Spectral state evolution of Cyg X-1 between 2003 and 2017 after Grinberg et al. (2013). The HSS is shown in red, the IS in green, and the LHS in blue. Unclassified data are plotted in gray. Upper panel: 30–50 keV INTEGRAL/ISGRI light curve. The vertical dashed line indicates the change of the INTEGRAL data analysis software. Lower three panels: RXTE/ASM, MAXI, and Swift/BAT light curves of Cyg X-1.
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