Stages of the inverted-Y-shaped jet along with the logarithm of the squashing factor (log Q), at different instances. In all panels, the grey-scale image at the bottom is the B_LOS map, while the yellow arrow points to the north limb. Panel (a) shows the magnetic field lines associated with the two 3D nulls, along with the UV brightening in yellow close to the outer 3D null and the QSEBs at the fan surface footpoints. The magnetic field lines are not shown in other panels to avoid clutter. All panels include log Q slices, where red indicates high Q values. The red arrow in panel (b) points to the region with the highest value along a vertical high Q line, where reconnection likely occurs. A brown layer in panels (b)–(f) shows the Hβ image at different wavelengths, which depict the various features of the inverted-Y-shaped jet. The dashed black arrow in panel (e) marks the distance between the vertical high Q line and the merging strands (1.2 Mm).