Selected field lines belonging to the three QSLs of NOAA 11589 identified in Fig. 6b, for the same extrapolations as in Fig. 7. Red/orange, dark/light-blue, and green field lines respectively belong to Q1, Q2, and Q3. The gray scale displays the photospheric map of the squashing degree, Q. Solid purple/cyan lines are isocontours of the photospheric vertical magnetic field, Bz = [ 150,300,600 ] Gauss.
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