Time evolution of the maximum (solid line) and mean (dot-dashed) relative divergence of the magnetic field in the simulations of the SSD. Since the induction equation is solved using a staggered constrained transport method, the update on the magnetic field keeps the divergence in Eq. (47) within round-off error. Although these errors accumulate in time, by the end of the simulation magnetic monopoles are still irrelevant to the dynamics of the SSD.