Schematic of the 3D geometry of the electron-scale magnetic hole at 21:27:30 UT on 2017 November 12. The red arrows indicate the possible trajectories of MM2 and MMS3. The orange arrows indicate the projection of the trajectories of MMS2 and MMS3. The deep (light) blue circle indicates the projection of the magnetic hole along the trajectory of MMS2 (MMS3).