2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93647Characteristic structures such as canals and ridges --intermode traces-- emerge in the spacetime representation of the probability distribution of a particle in a one-dimensional box. We show that the corresponding propagator already contains these structures. We relate their visibility to the factorization property of the initial wave packet.10 pages, 2 figures. It will appear in the Proc. of the PRL Golden Jubilee Conference on Nonlinear Dynamics and Computational Physics (Narosa Publishing House, New Delhi)Quantum Physicstext