Enter a species  (e.g. Al, Fe): Ar
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: LJ_Smoothed_Bernardes_1958_Ar__MO_764178710049_001
Enter hexagonal lattice constants 'a' and 'c' (m): 3.742230551411056e-10, 6.108079066670947e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -0.141631
         Iterations: 74
         Function evaluations: 193

Finished calculation

C11 = 5.242866018908414 GPa
C12 = 1.4106319251632709 GPa
  B = 2.688043289744985 GPa