Enter a species  (e.g. Al, Fe): Si
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: SW_BalamaneHaliciogluTiller_1992_Si__MO_113686039439_004
Enter hexagonal lattice constants 'a' and 'c' (m): 3.647017494663333e-10, 3.224000229574789e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -8.618229
         Iterations: 71
         Function evaluations: 186

Finished calculation

C11 = 475.58918487144365 GPa
C12 = 258.25699840833255 GPa
  B = 330.7010605627029 GPa