# type topo
# cell     3.414200     3.414200     2.000000    90.000000    90.000000    90.000000
12
  1 s      0.000000    1.707100    0.000000   0                             4/13      4/12      7/13      8/13 
  2 s      1.707100    0.000000    0.000000   0                             3/13      3/12      5/13      6/13 
  3 s      1.707100    0.000000    1.000000   0                             2/13      2/14     11/10     12/13 
  4 s      0.000000    1.707100    1.000000   0                             1/13      1/14       9/4     10/13 
  5 n      0.707081    0.000000    0.000000   1                             2/13      7/13      8/10 
  6 n      2.707119    0.000000    0.000000   1                             2/13      7/22      8/19 
  7 n      0.000000    0.707081    0.000000   1                             1/13      5/13       6/4 
  8 n      0.000000    2.707119    0.000000   1                             1/13      5/16       6/7 
  9 n      2.414181    1.707100    1.000000   1                             4/22     11/13     12/13 
 10 n      1.000019    1.707100    1.000000   1                             4/13     11/13     12/13 
 11 n      1.707100    2.414181    1.000000   1                             3/16      9/13     10/13 
 12 n      1.707100    1.000019    1.000000   1                             3/13      9/13     10/13