Enter a species  (e.g. Al, Fe): Si
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: SW_ZhangXieHu_2014OptimizedSW2_Si__MO_475612090600_004
Enter hexagonal lattice constants 'a' and 'c' (m): 3.532488422106494e-10, 3.136923759532664e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -6.004479
         Iterations: 70
         Function evaluations: 183

Finished calculation

C11 = 431.0705571488074 GPa
C12 = 225.6649755434878 GPa
  B = 294.133502745261 GPa