Synthetic magnetograms of the axial (a) and the azimuthal (b) magnetic field components of a uniformly twisted torus model with N_t, 0 = 0.5. (c) Total superposed magnetic field map. The red- and blue- shaded areas represent the positive and the negative value of B_z. The magenta contour in each map corresponds to |B_z| = 50 G (the maximum axial field is set to 1000 G). The associated movies are available online (fig1_a.avi, fig1_b.avi, and fig1_c.avi).