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Fig. 1.
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Sketch of the coronal flux-tube model. The isosurface of density with value equal to (ρi + ρe)/2 is shown in orange. Magnetic field lines located at r = 2R, r = R and r = 0 are drawn in green, blue, and red, respectively, for the model with c = 0.4. The bottom and top gray planes represent the solar photosphere.
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