Enter an atomic species: Ca Enter a cubic lattice type: fcc Enter a model name: Sim_LAMMPS_ReaxFF_ManzanoMoeiniMarinelli_2012_CaSiOH__SM_714124634215_000 Enter a lattice constant (m): 5.526318043470383e-10 WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.332e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.332e-09*i)