equation icon  ( ) ( ) (2) 1 (1)'' 1 (1)' 4 + z2 (1) 1 (1)' 1 (1) Re(S l ) = -- fl + --fl - ---2--fl - -- 2gl + --gl z z z { z z 1- ' 1-- O(zl- 2) for l = 2, 3, = - z (jl lnz) - z2jl ln z + O(zl- 4) for l > 4. (100)