Enter an atomic species: Sr Enter a cubic lattice type: fcc Enter a model name: Morse_Shifted_GirifalcoWeizer_1959LowCutoff_Sr__MO_801083489225_002 Enter a lattice constant (m): 6.126234233379364e-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 = 3.412e-09*i) WARNING, 1 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 3.412e-09*i)