Symmetry operations for the point group Ci (-1) 

1 : x,y,z           => 1                   
[[ 1.  0.  0.]
 [ 0.  1.  0.]
 [ 0.  0.  1.]]

2 : -x,-y,-z        => -1                  

[[-1.  0.  0.]
 [ 0. -1.  0.]
 [ 0.  0. -1.]]

Irreducible representations for the point group Ci  (-1)
Irrep Ag ( dimension  1 )
1 : 1.0                 

2 : 1.0                 

Irrep Au ( dimension  1 )
1 : 1.0                 

2 : -1.0                
