Enter a species  (e.g. Al, Fe): C
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: hNN_WenTadmor_2019Grx_C__MO_421038499185_001
Enter hexagonal lattice constants 'a' and 'c' (m): 2.31694625188116e-10, 1.83097470413507e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -13.178516
         Iterations: 72
         Function evaluations: 194

Finished calculation

C11 = 2736.0841719386867 GPa
C12 = 2148.619880932282 GPa
  B = 2344.4413112677503 GPa