Enter an atomic species: Pt Enter a cubic lattice type: fcc Enter a model name: MEAM_LAMMPS_KimSeolJi_2017_PtCo__MO_545073984441_000 Enter a lattice constant (m): 3.917371571063995e-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 = 2.952e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 2.952e-09*i)