Configuration of the KMT-2016-BLG-2364 lens system. The line with an arrow denotes the source trajectory with respect to the lens components that are marked by filled blue dots. The cusp-like closed figure drawn in red represents the caustic. The inset shows the enlargement of the central magnification region. The gray curves around the caustic represent equi-magnification contours. Lengths are normalized to the angular Einstein radius corresponding to the total lens mass.