3D view of the expected caustic pattern shortly after the shell-crossing for three-sine-wave initial conditions. The left panels correspond to the most typical pancake, here embodied by ANI-3SIN, but Q1D-3SIN would look similar, while the right ones show the axial-symmetric case, i.e. SYM-3SIN. The calculations are performed using 2LPT along with ballistic approximation (Eq. (53)), but higher-order LPT would provide the same topology from the qualitative point of view, except that the position of the caustic surfaces would change, especially in the axial-symmetric case.