2D maps comparing the relative importance of different azimuthally projected quantities: the Lorentz force with the contraction (first two panels) and the viscous term with the contraction (last two panels). The runs where the contraction term has been removed from the induction equation are presented in the first and third panels. In the other two, the effect of the contraction on the magnetic field is taken into account. The parameters are the same to those of Fig. 3.