Orbital geometry of PSR B1259-63/LS 2883. The black pentagrams are the phases of periastron and apastron, and superior and inferior conjunctions, while the empty circles mark the time intervals of every 20 d from periastron. The positions of double peaks in keV/TeV light curves are shown in green. The inclined disc projected on the orbital plane is illustrated in orange, with the dashed line being the midplane of the disc.