Three-dimensional geometry of the σ² CrB system. The binary components are shown to scale relative to the size of the orbit. The six panels correspond to various orbital phases as indicated in each plot. The orbital inclination is 28°. The shapes of the two stars are drawn according to the best-fitting Roche equipotential geometry. The surface of the primary is shown with dark (black) points; the surface of the secondary is shown with light (red) points. The plus sign corresponds to the centre of mass position.