Fig. 1.
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GX 1+4 light curves. a: GX 1+4 K2 lc1+lc2 light curve (black dots) with the SG filter overlayed (red line). b: K2 light curve after subtracting the SG filter. c: Swift/BAT light curve with 1-day bins in the 15–50 keV energy range. The long-term variability in X-rays, from the accretion process, seems to be closely followed by the optical light curve.
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