Enter an atomic species: Cu Enter a cubic lattice type: fcc Enter a model name: MEAM_LAMMPS_KangSaLee_2009_ZrAgCu__MO_813575892799_001 Enter a lattice constant (m): 3.613315649330616e-10 WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 7.530e-09*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 7.530e-09*i)