8
Eclipsed ethane has D3h symmetry
 1   0.000000159   2.091194879  -2.284679322
 6   0.000000159   2.091194879  -1.188679366
 1   1.033318678   2.091194879  -0.823345541
 6  -0.721720489   0.841138648  -0.678346356
 1  -0.516659399   2.986075055  -0.823346286
 1  -1.582819418   1.139431665  -0.069457258
 1  -0.032841250   0.244551525  -0.069457923
 1  -1.066159977   0.244552240  -1.530791083
