Fig. 10.
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Sketch of Vela X−1 with the photoionisation wake (in grey). NS (in black) is the neutron star at phase 0.4. The companion (in blue) is at the focus of the orbit. The angles θ and Θ are the immersion and the opening angles of the neutron star and the wake, respectively. The line AB is the line of apsides, and the line of sight is along the positive X axis.
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