a) Three-dimensional QSL computation obtained for iteration n = 40 000 of model U zoomed in on the circular ribbon region; the redder the QSLs the stronger they are. The maximum value of Q shown is 1010. It shows the different QSL volumes departing from the dome region and the null point. In particular, a set of QSLs extend in the direction of the spine. The red field lines are flux rope field lines that leave the dome after they go through a bald patch area, i.e., a region where dipped field lines are tangent to the photospheric boundary; Titov et al. (1993), as described also in Fig. 13. b) The same QSLs are plotted in a more global view showing that some 3D QSLs, which depart from the fan region on the western side, connect to the remote brightening on the eastern side. Specifically, a set of QSLs connect the flux rope to the western edge of the fan region to the remote brightening. On the bottom surface of both 3D plots we have shown the 2D horizontal map at z = 4 Mm with the same color scaling. c) 2D map of the QSLs at z = 4 Mm from the Pariat & Démoulin (2012) calculation technique, zoomed in on the circular ribbon region. The yellow lines are the fan of the null point, while the red lines show the spine. d) This zoomed out 2D map shows the QSL signature; the spine red field line connects to the eastern area of the active region.
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