1 - Satellite potential
2 - B field in GSE
3 - EFW E field in despinned reference frame. The red line is Ez calculated from E.B=0 assumption. It is used when B elevation angle with respect to the spin plane is more than 5 degrees.
4 - v_MP x B in magnetopause reference frame (as expected there is only tangential component). 
5 - E (z component set to zero) + v_MP x B in MP reference frame
6 - E (z component from E.B=0) + v_MP x B in MP reference frame. Note, that for time periods when B elevation angle is less than 5 degrees panels 5 and 6 are the same
7 - B elevation angle