Enter a species  (e.g. Al, Fe): Na
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959MedCutoff_Na__MO_636041334617_004
Enter hexagonal lattice constants 'a' and 'c' (m): 3.849226932080406e-10, 6.294969307175981e-10