Sketch of considered scenario (not to scale). We show a jet segment at a height z (black dot) and its projection in the xz-plane (grey dot). We also show the recollimation height z_rec, the length l along the jet, the jet half-opening angle θ_j, the jet bending angle with respect to the z-axis (θ), the inclination angle of the orbit i, the orbital separation a, the star radius R_⋆, and the orbital phase φ (set to 0 and 0.5 for the inferior and superior conjunctions, respectively). The counter-jet (not shown) is symmetric to the jet with respect to the xy-plane.