Schematic drawing of the unresolved center of the Red Rectangle, which is inclined by 5° with respect to the line of sight (LOS). The plane of the sky is perpendicular to the sheet, and the line-of-sight is represented in red. The spikes that are observed in the red are represented as dashed black lines. The central binary system is represented by an orange circle (the AGB) and an orange rectangle (the accretion disc). The light grey area around the central system is the optically thick torus, which has an outer radius estimation of 1850 AU, an inner radius (the cavity of the binary system) of 14 AU, and a thickness of about 100 AU (Bujarrabal & Alcolea 2013). The dark grey area represents the area of the Red Rectangle is hidden to the observer by the circunbinary disc. The disc is so large that about 161 AU height as measured from the plane of the binary system is obscured.