Enter a species  (e.g. Al, Fe): Eu
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: LJ_ElliottAkerson_2015_Universal__MO_959249795837_003
Enter hexagonal lattice constants 'a' and 'c' (m): 3.851351319157041e-10, 6.289355792320306e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -7.159918
         Iterations: 73
         Function evaluations: 191

Finished calculation

C11 = 225.77631213839427 GPa
C12 = 60.425100956324265 GPa
  B = 115.5421713503476 GPa