I understand non-diagonal in \epsilon_{G,G'} would also contribute into eps_00^-1 when the local field effect is included, and I added the local field effect before. No obvious difference in eps_{infty} is found. (see attachment)1/eps_00^-1 which is different from eps_00

Also the effect of electron temperature has been checked. the result is almost same.

b.t.w, have you read any work to determine \eps_{infty}} of metal accurately based on RPA+DFT ?

Best,

Weiqing