Equation Icon  (-1,- 1) r12[ <ij> <i j> <ij>] Yij = --- y 1 + y1 y 2 + y2 , 3 [ ( ) ] [ ( ) ] [ ( ) (]217) (-2,- 1) <ij> 16- r12 188- <i j> 8-- r12- -4-- <ij> 2- r12 -2- Yij = y1 15 ln r - 225 + y1 y2 15 ln r - 225 + y2 5 ln r - 25 . 0 0 0