$cell vectors
1.0
  3.9091981605581103    0.0000000000000000    0.0000000000000000
  0.0000000000000000    3.8712981783916436    0.0000000000000000
 -0.0511698229299495    0.0000000000000000    3.9088632500680052
 1 1 3
Direct
  0.0000000000000000    0.0000000000000000    0.0000000000000000 # Na1
  0.4999999999999992    0.4999999999999994    0.5000000000000007 # Nb1
  0.4999999999999992    0.0000000000000000    0.5000000000000007 # O1
  0.0000000000000000    0.4999999999999994    0.5000000000000007 # O2
  0.4999999999999992    0.4999999999999994    0.0000000000000000 # O3