Geometry of the MYTorus model. The reflector is a torus, whose section is shown in blue. The source of X-ray photons is the magenta star in the center, which is isotropic. The inclination angle i is defined as the angle between the normal to the plane of the torus and the observer. In the MYTorus model, the ratio between the major and minor radii of the torus, R/r, is 2, leading to a half opening angle φ = 60 deg.