Enter an atomic species: Ar Enter a cubic lattice type: fcc Enter a model name: Exp6_KongChakrabarty_1973_ArNe__MO_946046425752_002 Enter a lattice constant (m): 5.235186479985714e-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 = 1.839e-09*i) WARNING, 2 imaginary frequencies at q = ( 0.00, 0.00, 0.00) ; (omega_q = 1.839e-09*i)