Si
 1.0000000000000000
    -3.3708721802442598    3.3708721802442598    3.3708721802442598
     3.3708721802442598   -3.3708721802442598    3.3708721802442598
     3.3708721802442598    3.3708721802442598   -3.3708721802442598
 Si 
   6
Cartesian
  1.6854360901221301 -0.0000000000000005  3.3708721802442589
  1.6854360901221301  3.3708721802442589 -0.0000000000000003
  3.3708721802442594  1.6854360901221295 -0.0000000000000003
 -0.0000000000000004  1.6854360901221304  3.3708721802442598
 -0.0000000000000002  3.3708721802442598  1.6854360901221297
  3.3708721802442603 -0.0000000000000006  1.6854360901221288