Magnetic field model showing field lines that trace the BP separatrices. a) This plot corresponds to the point of view of the observer. Field lines extending to the east are large scale and open in our model (i.e., they reach the borders of our computational domain). b) This plot shows the field lines from a different point of view (rotated by around 180° and seen sideways) to clearly illustrate that the separatrix traces to the east are not at the photosphere but reach the top surface of the drawn box. The height of the box is 50 Mm in this figure. For clarity we are only including field lines tracing BP1 separatrix in this panel, a similar field line tracing is found for BP2. The conventions for the field isocontours, axes, BPs, and separatrix traces are the same as in Fig. 10.
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