Results of magnetic field extrapolations using the HMI full-disk vector magnetic field observed at 04:00 UT on 2012 May 10. (a) The flux rope obtained through the forced-field extrapolation. (b) The flux rope and the dome structure above the flux rope. (c), (d) The magnetic field structure from different perspectives in a larger field of view than that of (a) and (b). The magnetic fields above the flux rope are obtained through the potential field extrapolation. The red dotted box in panel (d) corresponds to the FOV of panels (a) and (b). The white box and two arrows in panel (d) mark the slices where we calculate the Quasi-Separatrix Layers (QSLs) shown in Figure 7.