What's in front of the trees?
The field is in front of the trees.
    src        edge_attr  dst
0     0  to the right of   10
1     0   to the left of    6
2     0   to the left of    5
3     1           behind   10
4     1   to the left of    8
..  ...              ...  ...
93   16   to the left of    2
94   17   to the left of    5
95   17   to the left of   11
96   17   to the left of    7
97   17   to the left of    6

[98 rows x 3 columns]