Enter an atomic species: Ce Enter a cubic lattice type: fcc Enter a model name: Sim_LAMMPS_ReaxFF_BrugnoliMiyataniAkaji_SiCeNaClHO_2023__SM_282799919035_000 Enter a lattice constant (m): 5.152935631573201e-10 WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.370e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.370e-09*i)