Enter an atomic species: Ni Enter a cubic lattice type: fcc Enter a model name: MEAM_LAMMPS_ShimParkCho_2003_NiW__MO_500937681860_002 Enter a lattice constant (m): 3.521391771733761e-10 WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 6.796e-09*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 6.796e-09*i)