Upper panels illustrate a horizontal flux system seeded consistently in space at t = 9 669 s (left) and t = 11 040 s (right). Red lines are seeded with Lagrangian markers as reported in Robinson et al. (2022). Center panels illustrate the time evolution of a horizontal flux system seeded by Lagrangian markers at t = 11 040 s (right) and traced backward in time (left). Lower panels are the same as center panels, except seeded by Lagrangian markers beginning at t = 9 669 s (left) and traced forward in time (right).