Equation Icon  ( ) 2 M ′= − G-- Qjk′′′Qjk ′′′ + Qjk ′′′Qjk ′′′ − 4q--(ηk′′ηk′′+ ηk′′ηk ′′) B 5c7 Mass Mass Spin Spin 3c5 E E M M -4---( jk′′′ jk′′′ jk′′′ jk′′′) − 45c7 Q E QE + Q M Q M . (6.52 )