Top five panels: phase plot of GX 1+4 at different spectral ranges with the orbital period of 1160.8 d (Hinkle et al. 2006), where orbital phase φ = 0 corresponds to the time of periastron passage (Eq. (1)). The vertical gray lines are times of neutron star eclipse according to Eq. (2). Bottom panel: phase plot of hardness of GX 1+4. The hardness is defined as a difference between count rate in 30.0–63.3 keV range and in 17.3–22.1 keV range.