Enter an atomic species: Ar Enter a cubic lattice type: fcc Enter a model name: Morse_QuinticSmoothed_Jelinek_1972_Ar__MO_908645784389_002 Enter a lattice constant (m): 5.252865672111511e-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