Enter a species  (e.g. Al, Fe): Cu
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959LowCutoff_Cu__MO_673777079812_003
Enter hexagonal lattice constants 'a' and 'c' (m): 2.579154292648738e-10, 4.192818448599413e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -6.550036
         Iterations: 72
         Function evaluations: 190

Finished calculation

C11 = 274.58556298878403 GPa
C12 = 68.29708530869604 GPa
  B = 137.0599112020587 GPa