Simulation results of the flux rope in the BPS configuration. Panels (a)–(d) illustrate the evolution of the magnetic configuration for the case with C_E = 1.85, and panel (e) plots the evolution of the height of the rope axis. The vertical dotted lines correspond to the times of panels (a)–(d). Panels (f)–(l) show the results for the case with C_E = 1.90. The meanings of the symbols and colors are the same as in Fig. 1.