Enter an atomic species: Ag Enter a cubic lattice type: fcc Enter a model name: Morse_Shifted_GirifalcoWeizer_1959HighCutoff_Ag__MO_111986436268_004 Enter a lattice constant (m): 4.073291137814522e-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 = 1.534e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.534e-09*i)