Post-kick inclination of the orbital plane (with respect to the pre-kick plane) and binary systemic velocity, v_sys, as a function of the natal kick magnitude v_kick. In light blue we show binaries matching the orbital parameters of GX 301–2 in its HMXB phase, while grey points represent all the natal kicks explored in detail. In the top and on the right, we show the weighted histograms. Black solid lines show the contour of the 99% credible regions for the chosen kicks’ distributions.