Sn 
 1.0000000000000000
     3.7914823914738967   -0.0000000000000000    0.0000000000000000
     0.0000000000000000    3.7914823914738962    0.0000000000000000
    -0.0000000000000000    0.0000000000000000    3.7914823914738967
 Sn 
   2
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
  1.8957411957369485  1.8957411957369485  1.8957411957369485   T   T   T