Enter an atomic species: Ca Enter a cubic lattice type: fcc Enter a model name: EAM_IMD_BrommerGaehlerMihalkovic_2007_CaCd__MO_145183423516_003 Enter a lattice constant (m): 5.6709064245224e-10 Writing phonon.eq.pckl Writing phonon.0x-.pckl Writing phonon.0x+.pckl Writing phonon.0y-.pckl Writing phonon.0y+.pckl Writing phonon.0z-.pckl Writing phonon.0z+.pckl WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.661e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 4.661e-09*i)