Cartoon illustrations of the geometries associated with each model. The wabs model b) represents an absorbing slab in the line of sight, and can also be interpreted as the case of a torus with extreme opening angle. While torus d) uses a intermediate opening angle, the sphere c) represents the other extreme, a vanishing opening angle. The +scattering extension e) of the named models correspond to Thomson scattering from outside the line of sight, which does not experience any energy-dependent effects. Finally, the reflection component (+pexmon) corresponds to either disk reflection f) or additional reflection if the torus is not viewed through the same column density as the reflection g), h), i). For the sphere it should be noted that scattering is not physically possible, as no unabsorbed radiation can escape.