Enter an atomic species: Pt Enter a cubic lattice type: fcc Enter a model name: Tersoff_LAMMPS_AlbeNordlundAverback_2002_PtC__MO_500121566391_002 Enter a lattice constant (m): 3.917386054992676e-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, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 6.469e-09*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 6.469e-09*i)