# type topo
# cell     1.994900     1.994900     1.467900    90.000000    90.000000    90.000000
4
  1 s      0.000000    0.657719    0.000000   0                             2/13      2/12       3/4      4/12 
  2 s      0.000000    1.337181    0.733950   0                             1/13      1/14       3/7      4/16 
  3 s      1.337181    0.000000    0.366975   0                             1/22      2/19      4/13      4/12 
  4 s      0.657719    0.000000    1.100925   0                             1/14      2/10      3/13      3/14