Illustrations of the initial magnetic field lines in (a) the Alfvén wave model, (b) the arcade model, and (c) the complex magnetic field model. The left panel of (c) shows the projection of the field lines onto the xy plane. Panels b and c: were modified from Howson et al. (2020a,b), respectively. The LOS angles are denoted by LOS_x (green) and LOS_y (purple) when aligned with the x and y axes, respectively.