Schematic representation of the geometry of the CVSO 104 A system in the orbital plane. The dark shaded surfaces represent the primary (at left) and secondary component, while the light-grey one is the critical Roche surface. The size and separation of the stars and Roche lobes as well as the position of the barycenter (MC) and the Lagrangian point L₃ are to scale. The source of the excess Hα and Hβ emission is represented by the shaded green area.