Magnification maps obtained for a (κ = 0,γ = 0.5) Chang-Refsdal lens (upper panels) and a (κ = 0,γ = 2) Chang-Refsdal lens (lower panels). From left to right, the caustics are rotated by 0°, 30°, 45°, 60°, and 90° to prevent biases due to alignments between the BLR model symmetry axes and the caustics. The magnification maps are simulated over a 30 r_E × 30 r_E region of the source plane but the above panels illustrate a 10 r_E × 10 r_E zoom of the caustic structure.