F Rb 
 1.0000000000000000
     3.9527149391897205   -0.0000000000000000   -0.0000000000000000
     0.0000000000000000    3.9527149391897205    0.0000000000000000
     0.0000000000000000    0.0000000000000000    3.9527149391897205
 F   Rb 
   1   1
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
  1.9763574695948602  1.9763574695948602  1.9763574695948602   T   T   T