Enter an atomic species: Pb Enter a cubic lattice type: fcc Enter a model name: EAM_Dynamo_WangZhuXiang_2018pot2_Pb__MO_961101070310_000 Enter a lattice constant (m): 4.989170035719873e-10 WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.246e-09*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.246e-09*i)