Logarithmic density contours along with magnetic field lines (left) and vertical velocity contours together with poloidal current lines (right) for the initial conditions of model NIP. The dashed line indicates the surface A_mix around which the mixing is assumed, and also marks the polarity reversal for the anti-parallel configurations. The thick solid line shows the separatrix beyond which a constant pressure is initially applied on the pressure-confined models. The initial setup of NIA is identical except for the opposite sign of B and J in the central regions.