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Fig. 2.

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NuSTAR CCD of GX 3+1. The soft and hard colors are defined as the ratio of the counts in the 6–10/3–6 keV and 10–20/6–10 keV bands, respectively. Empty black circles denote the NuSTAR points not simultaneous with IXPE observation. The red and purple boxes correspond to the LB and UB region. Each bin corresponds to 200 s.
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