equation icon  2( )2 [ ] H-- M--p V-' --1-+-V-/c-- e =_ - H2 = 16p V (1 + V /2c)2 , (203) 2 ( '') [ ] j =_ - -¨f--= M-p- V-- ----1---- . (204) Hf 8p V 1 + V/2c