(a) Map of the difference in the radial component of the magnetic tension between our simulation with x_c = 0.5 Mm and L_∥ = 0.5 Mm and the analogous magnetic tension in a configuration where we set B_z0 = 0 on the plane z = 0. (b) Radial component of the gradient of the total pressure at t = 10 s in the same simulation as (a). In both panels some representative field lines are superimposed.