Enter a species  (e.g. Al, Fe): Ca
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959LowCutoff_Ca__MO_887105884651_003
Enter hexagonal lattice constants 'a' and 'c' (m): 3.968507716889079e-10, 6.492668175553202e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -3.421302
         Iterations: 71
         Function evaluations: 181

Finished calculation

C11 = 33.88114185610328 GPa
C12 = 8.316863272074983 GPa
  B = 16.83828946675108 GPa