What's the field in front of?
The field is in front of the trees.
    src        edge_attr  dst
0     0  to the right of   13
1     1  to the right of    6
2     1   to the left of    2
3     1  to the right of   11
4     1  to the right of   10
..  ...              ...  ...
72   19   to the left of    3
73   20   to the left of    9
74   20  to the right of   14
75   20  to the right of   18
76   21  to the right of   19

[77 rows x 3 columns]