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Fig. 2.

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NuSTAR observation of GX 301−2 in the context of its long-term behavior. a: hardness ratio, (H − S)/(H + S), of NuSTAR observation with hard energy range 10–30 keV and soft energy range 4–10 keV. The dashed lines indicate the division into time segments studied individually in Sect. 3.2. b: light curve of NuSTAR observation. c: Swift light curve between MJD 59100 and MJD 59300 (Krimm et al. 2013). We show ∼5 orbital periods and indicate the pre-periastron flares with orange bars.

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