species[] site[] count[]
       1    1     3
       2    1     1
       3    1     6
       1    2    10
       2    2     6
       3    2    21
       1    3     0
       2    3     0
       3    3     3
       1    4     5
       2    4     2
       3    4    12
       1    1     3
       2    1     0
       3    1     6
       1    2     8
       2    2     1
       3    2    21
       1    3     0
       2    3     1
       3    3     6
       1    4     5
       2    4     0
       3    4    13
END