Fig. 2
Example of variability on a short timescale in the 30.0–63.3 keV range (black points; left axis) together with observations in the I-band (red points; right axis) scanned from Majczyna et al. (2015). The green area indicates time of periastron passage (Eq. (1)) and the gray areas indicate time of the potential eclipse of the neutron star (Eq. (2)).
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