Large-scale potential field extrapolation of V530 Per. The star is seen at phase 0.0, with a 40° inclination angle. The blue and white lines represent open and close field, respectively. The color scale on the surface show the strength of the radial field component (in Gauss), following Fig. 5. The source surface is located at 2.5 R_*, which is a bit further away from the star than the corotation radius (at 1.9 R_*).