# type topo
# cell     2.578000     2.578000     2.000000    90.000000    90.000000    90.000000
8
  1 s      0.000000    1.289000    0.000000   0                             2/13      2/12      5/13       6/4 
  2 s      0.000000    1.289000    1.000000   0                             1/13      1/14      7/13       8/4 
  3 s      1.289000    0.000000    1.000000   0                             4/13      4/14      7/10      8/13 
  4 s      1.289000    0.000000    0.000000   0                             3/13      3/12      5/13      6/10 
  5 n      0.353444    0.353444    0.000000   1                             1/13      4/13       6/1 
  6 n      2.224556    2.224556    0.000000   1                             1/22      4/16      5/25 
  7 n      0.935556    1.642444    1.000000   1                             2/13      3/16      8/13 
  8 n      1.642444    0.935556    1.000000   1                             2/22      3/13      7/13