Unstratified atmosphere. Height of flux rope center for a set of five simulations with varying magnitude of initial background magnetic guide field and resistivity models. Three values of the guide magnetic field b_z0 = { 1.0,0.5,0.25 } and two resistivity models, one with labeled as “eta const”, and one with and j_c = 10 labeled as “eta anom”, both using the constant background resistivity value η_bg = 10^-5, are considered.