 format  1  0
Bravais = basis  (group pm)
2       = dim
2       = # symmetries

1 (I)
  1.0   0.0     0.0
  0.0   1.0     0.0

2 (2 0,0)
 -1.0   0.0     0.0 
  0.0   1.0     0.5 

