Orbital phases (marked by vertical lines) of the Chandra (red dashed lines), XMM-Newton (black dotted line), and NuSTAR observations (where we indicate the phase of the start and stop times) overlaid on the INTEGRAL/IBIS/ISGRI orbital curve of XTE J1739−302, we have drawn from Drave et al. (2010). We remark that the uncertainty on the position of the vertical lines is Δϕ = ±0.05, extrapolating Drave’s ephemeris at the time of these observations.