$cell vectors
1.0
  6.7539968219608788    0.0000000000000000    0.0000000000000000
  0.0000000000000000    6.7539968219608788    0.0000000000000000
  0.0000000000000000    0.0000000000000000    4.1099980660733237
 4
Direct
  0.2199999999999999    0.2799999999999997    0.0000000000000000 # S1
  0.7199999999999995    0.2199999999999999    0.5000000000000000 # S2
  0.7799999999999999    0.7199999999999995    0.0000000000000000 # S3
  0.2799999999999997    0.7799999999999999    0.5000000000000000 # S4