Si fcc ThreeBodyCluster_Gong_Gong_1993_Si__MO_407755720412_000 3.90822599083 Optimization terminated successfully. Current function value: -25.786449 Iterations: 72 Function evaluations: 191 C11 = 829.687386 +/- 0.007336 GPa C12 = 529.036351 +/- 0.005187 GPa C44 = 336.976736 +/- 0.001834 GPa B = 629.253363 +/- 0.004235 GPa