Ray-tracing calculations of the linear Stokes parameters Q and U in a vertical plus radial magnetic field with the same θ as those in the analytic model. The coarse QU loops are due to the time sampling in our simulations. Top: magnetic field inclination of θ = 0 (completely vertical). Bottom: significantly radial magnetic field (θ = 80). In contrast to the analytic case, numerical calculations in a completely vertical magnetic field at low inclinations show that Q and U oscillate in time and trace loops in QU space due to light bending.