Cross section of the one-zone, two-angle model for the spectroscopy of the n = 0 and n = 1 images. Blue lines indicate field lines, while red rays show the optical path. The same uniform plasma occupies both cells, but the two cells make different angles of incidence with the rays, and the reduced on-sky area of the n = 1 image is represented by shrinking one dimension of the cube by e^−π. In this example for a 5M cube emitter, the n = 0 magnetic field incidence angle is 135°, while the n = 1 is 45°; rays passing through the n = 1 region still experience radiative transfer through the n = 0 region. Both regions are assumed to be at rest.