6
Ethene has D2h symmetry
 1   0.030847838   1.761006088  -2.376932470
 6   0.030847838   1.761006088  -1.280932514
 6   1.184367595   1.761006088  -0.614947294
 1  -0.918315837   1.761006088  -0.732932417
 1   2.133531524   1.761006088  -1.162946996
 1   1.184367031   1.761006088   0.481052690
