Enter a species  (e.g. Al, Fe): Si
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: SW_ZhangXieHu_2014OptimizedSW1_Si__MO_800412945727_004
Enter hexagonal lattice constants 'a' and 'c' (m): 2.748492042440921e-10, 4.488268710720149e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -6.665959
         Iterations: 73
         Function evaluations: 186

Finished calculation

C11 = 773.7797372941485 GPa
C12 = 639.8498881749965 GPa
  B = 684.4931712147138 GPa