Configuration of the lens system for the lensing event KMT-2022-BLG-0412. The red figure composed of concave curves represents the caustic, while the arrowed line represents the trajectory of the source. The grey curves encompassing the caustic represent equi-magnification contours. Lengths are scaled to the angular Einstein radius of the lens system. The inset shows the comprehensive view including the positions of the lens components (marked by blue dots) and Einstein radius (dotted circle).