Enter an atomic species: Al Enter a cubic lattice type: fcc Enter a model name: Tersoff_LAMMPS_PlummerRathodSrivastava_2021_TiAlC__MO_992900971352_000 Enter a lattice constant (m): 4.0415970236063e-10 WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.257e-08*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.257e-08*i)