# type topo
# cell     1.511700     1.309500     1.870700    90.000000   110.704000    90.000000
4
  1 v      1.181006    0.000000    0.375001   0                             2/22      2/21      3/22      3/19      3/13      3/10      4/12       4/9 
  2 v     -0.330674    0.000000    1.374888   0                              1/4       1/5      3/11      3/14      4/10      4/13       4/1       4/4 
  3 v      0.425156    0.654750    0.375001   0                              1/4       1/7      1/13      1/16      2/15      2/12      4/13      4/12 
  4 v      0.425176    0.654750    1.374888   0                             1/14      1/17      2/16      2/13      2/25      2/22      3/13      3/14