Left: three representative periodic orbits in the restricted three-body problem calculated for a binary with q = 0.15. The red line shows the largest (truncated) streamline that does not intersect any other orbit. The solid blue and dashed black lines show the orbits whose periods are three and four times shorter than the binary orbital period (3:1 and 4:1 resonance orbits). The Roche lobe is shown with a solid black line. r₁, r₂, and r_max are different radii of the streamline. Right: truncated, 3:1, and 4:1 orbits shown in velocity coordinates (Doppler map). A and B mark the areas beyond the truncated orbit and their corresponding (roughly) location in the Doppler map. See text for detail.