Selected field lines of the six test cases: a) the potential field of a double dipole, BDD; b) the TD model, BTD; c) the MHD model, BMHD; d) the NLFFF model of the nonpreprocessed magnetogram of AR 11158, BEx1; e) the NLFFF model of the preprocessed magnetogram of AR 11024, BEx2PP; f) the NLFFF model of the nonpreprocessed magnetogram of AR 11024, BEx2. The vertical component of the magnetic field at the bottom boundary is shown on a gray scale, with the positive (respectively, negative) polarity in white (respectively, black). The different line colors outline different types of connectivities.
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