Lens system configurations for the close (upper panel) and wide (lower panel) 2L2S solutions of OGLE-2018-BLG-0584. In each panel, the close figure represents the caustic, and the two lines with arrows marked by S₁ and S₂ represent the trajectories of the primary (S₁) and secondary (S₂) source stars. The grey curves encompassing the caustic represent the equimagnification contours. The inset in each panel shows the whole view of the lens system, where the blue dots represent the positions of the binary lens components and the dotted circle is the Einstein ring.