Fig. 3
Vela X-1 folded orbital light curves in 4−10 (blue dots), and 10−20 keV (red triangles) energy ranges. The horizontal bars indicate the phase-bin. The mid-eclipse time is taken as the phase zero. The three orbital phase bins (X, Y, and Z) used for the phase-resolved spectroscopy of the double-peaked sample are indicated (see text).
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