Nb 
 1.0000000000000000
     3.3264647330193471    0.0000000000000000    0.0000000000000000
     0.0000000000000000    3.3264647330193471   -0.0000000000000000
    -0.0000000000000000   -0.0000000000000000    3.3264647330193471
 Nb 
   2
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
  1.6632323665096733  1.6632323665096733  1.6632323665096733   T   T   T