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Fig. 1.

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MAXI daily light curve of GX 9+9 (photon cm−2 s−1). Top panel: 2–20 keV photon flux. Bottom panel: hardness ratio between the 10–20 keV and 4–10 keV photon fluxes. The vertical dashed line marks the date of the IXPE and NuSTAR observation.
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