Enter a species  (e.g. Al, Fe): Ca
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959MedCutoff_Ca__MO_562200212426_003
Enter hexagonal lattice constants 'a' and 'c' (m): 3.938492516063839e-10, 6.429641817617258e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -3.665018
         Iterations: 70
         Function evaluations: 182

Finished calculation

C11 = 34.48396851439847 GPa
C12 = 8.332079487399765 GPa
  B = 17.049375829732668 GPa