INTEGRAL/ISGRI (20–100 keV) orbital profile of LS 5039. The light curve has been folded into 16 phase bins at the orbital period of 3.90603 days and epoch time T₀ = 51942.59 MJD (at orbital phase ϕ = 0.0). The red dashed lines indicate the interval of the INFC and SUPC orbital phases. The superior conjunction and inferior conjunction are shown as blue dashed lines: ϕ = 0.058 and ϕ = 0.716, respectively. The orbital periastron and apastron are at the phases ϕ = 0.0 and ϕ = 0.5, respectively. The period is repeated once for clarity.