Top panel – top view of the vertical magnetic field (color code) used to approximate the photospheric LOS component of the photospheric magnetic field of AR8210. The three positive polarities (P11–P12, P3, P4) and the main negative polarity (N1) are indicated in the figure. Also shown are the positions of the flares, sites A and B, and the flaring region, denoted by the circular F region. Bottom panel – lateral view at the vertical component of the magnetic field (color code) at the bottom of the simulation box together with selected magnetic field lines illustrating the initial potential field configuration. The lateral view is along the positive X axis.