Dear Samuel thank you very much my problem has been solved however for eliashberg spectral function i could not reproduce the results of your paper so i must use 14x14x14 K_POINTS AUTOMATIC in scf.in file and nq1=10, nq2=10, nq3=10, in the ph.in file and in scf_epw.in K_POINTS AUTOMATIC 14 14 14 0 0 ...