# type topo
# cell     2.309900     2.309900     2.309000    90.000000    90.000000    90.000000
8
  1 s      0.000000    0.000000    0.000000   0                             3/10      4/12       7/3       8/1 
  2 s      1.154950    0.000000    1.154500   0                             3/10      4/13      7/13      8/10 
  3 s      0.577475    1.732425    0.577250   0                             1/16      2/16      5/13      6/13 
  4 s      0.577475    0.577475    1.731750   0                             1/14      2/13      5/13      6/14 
  5 s      1.154950    1.154950    1.154500   0                             3/13      4/13      7/13      8/13 
  6 s      0.000000    1.154950    0.000000   0                             3/13      4/12       7/3       8/4 
  7 s      1.732425    0.577475    1.731750   0                             1/23      2/13      5/13      6/23 
  8 s      1.732425    1.732425    0.577250   0                             1/25      2/16      5/13      6/22