Dear Dev, I also have never used this feature of the code but Doc directory has useful documents when you need answers: Doc/eps_man.tex It is clearly stated there that "the non-local contribution due to the pseudopotential is neglected. Actually the correction to the matrix element that take into account the non-local part of the Hamiltonian is not implemented." So to develop the code for USPP you need to find a way to calculate & add these corrections, I guess. You can check epsilon.f90 to learn more.. emine kucukbenli, Sissa, Italy
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