Enter a species  (e.g. Al, Fe): Cu
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959MedCutoff_Cu__MO_173787283511_003
Enter hexagonal lattice constants 'a' and 'c' (m): 2.554536138791302e-10, 4.172096998545641e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -6.988550
         Iterations: 71
         Function evaluations: 181

Finished calculation

C11 = 277.7578833045544 GPa
C12 = 68.80907211897711 GPa
  B = 138.45867584750286 GPa