Enter an atomic species: Al Enter a cubic lattice type: fcc Enter a model name: MEAM_LAMMPS_PascuetFernandez_2015_AlU__MO_596300673917_002 Enter a lattice constant (m): 4.049998879432679e-10 WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.376e-08*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.376e-08*i)