4

Si     -0.041051802964672      0.202593906301979      0.065041288724572
Si      1.208659435777255      1.365502112363494      0.222770837519064
Si      1.539868552583854      0.183628102820145      1.695819204081890
Si      0.146850091681325      1.769594050077381      1.676262330459124