Geometry of the binary system and the jet of BD+46°442 at superior conjunction, when the post-AGB star is directly behind the jet, as viewed by the observer. In all three plots the full orange circle denotes the post-AGB star. The orange star indicates the location of the companion. The red cross is the location of the centre of mass of the binary system. The radius of the post-AGB star is to scale. The jet is represented in blue, and the colour indicates the relative density of the jet (see colour scale). The dashed black line is the jet axis and the dotted white lines are the inner jet edges. The jet cavity is the inner region of the jet. Upper left panel: system viewed along the orbital plane from a direction perpendicular to the line of sight to the observer. Right panel: jet viewed from an angle perpendicular to the X-axis. The post-AGB star is located behind the companion and its jet in this image. The jet tilt is noticeable from this angle. Lower left panel: binary system viewed from above, perpendicular to the orbital plane. The grey dashed lines represent the Roche radii of the two binary components and the full black line shows the Roche lobes.