Si 
 1.0000000000000000
     8.4918803851207283   -0.0000000000000000    0.0000000000000000
     0.0000000000000000    8.4918803851207283   -0.0000000000000001
    -0.0000000000000000   -0.0000000000000001    8.4918803851207301
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  4.2459401925603677  4.2459401925602664   T   T   T
  4.2459401925603677 -0.0000000000000001  4.2459401925602673   T   T   T
  4.2459401925603677  4.2459401925603677 -0.0000000000000001   T   T   T