 O Na Nb
   1.0
     3.9784060100000000    0.0000000000000000    0.0000000000000000
     0.0000000000000000    3.9784060100000000    0.0000000000000000
     0.0000000000000000    0.0000000000000000    3.9784060100000000
 O Na Nb
   3   1   1
Direct
   0.0000000000000000  0.5000000000000000  0.5000000000000000
   0.5000000000000000  0.0000000000000000  0.5000000000000000
   0.5000000000000000  0.5000000000000000  0.0000000000000000
   0.0000000000000000  0.0000000000000000  0.0000000000000000
   0.5000000000000000  0.5000000000000000  0.5000000000000000