Eyvaz Isaev wrote:
> 10^{-18} looks VERY strong (and time consumable) criteria for
> phonon convergence threshold. The default value thr2_ph=10^{-12}. for ultrasoft pseudopotentials, it's a safe criterion. The default is usually too large for US PP P. -- Paolo Giannozzi, Democritos and University of Udine, Italy
