The spacetime diagram of the magnetic-flux function Φ evaluated on the midplane. For model rc_36_B_s, we include the timescale for the advection, ejection, and generation of poloidal loops. For model rc_36_B_w, we highlight the time interval during which magnetic-flux inversion occurs without any clear signature of inward magnetic-flux advection. We show in Appendix D that during this interval the magnetic loops are instead dragged inward along directions away from the midplane.