Fig. 2.
Morphology of the 3D magnetic field of AR 11158 on 01:11 UT of 15 February 2011, for the NLFF extrapolation used in this work. The field lines are coloured according to the value of RFLH, which is positive for all selected field lines; they are overplotted on the photospheric distribution of the vertical magnetic field, with the red contours corresponding to the values |Bz| = 500 G.
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