Magnetic fan-spine topology showing a UV brightening at a magnetic null point and a QSEB at the outer spine’s footpoint, resembling the configuration in Fig. 2b. Panels (a) and (b) show the same instance from different viewpoints. Two QSEBs are observed near the UV brightening: QSEB-A is positioned at the footpoint of the outer spine, while QSEB-B is located at a dipole configuration, with one footpoint on the negative polarity patch where the footpoint of the fan-spine with 3D null is also located. QSEB-B is not part of the same reconnection event as the UV brightening and QSEB-A, which are associated with the fan-spine topology. Panel (c) shows the B_LOS map with contours at 1σ above the noise level with different markers: The orange crosses denote the projection of the null point of the UV brightening, and yellow circles denote the footpoints of the dome. The yellow circles on the positive polarity show the footpoints of the outer spine. The red star marker denotes where QSEB-A is located. The blue and red circles denote the footpoints of the dipole of QSEB-B. The cyan star points to the location of QSEB-B, which occurs at the PIL. The dashed pink boxes show the area considered to calculate the magnetic flux and magnetic energy for the two QSEBs, as shown in Fig. 8. Yellow arrows in all panels show the direction towards the limb.