Enter a species  (e.g. Al, Fe): Na
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959LowCutoff_Na__MO_707981543254_003
Enter hexagonal lattice constants 'a' and 'c' (m): 3.930679018046066e-10, 6.456688796565875e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -2.001995
         Iterations: 72
         Function evaluations: 188

Finished calculation

C11 = 12.705574020113765 GPa
C12 = 3.0704454336475124 GPa
  B = 6.282154962469596 GPa