What is the sign surrounding?
The sign is surrounding the plants.
     src        edge_attr  dst
0      0  to the right of    9
1      0   to the left of    8
2      0  to the right of   39
3      1  to the right of   16
4      3   to the left of   43
..   ...              ...  ...
230   48   to the left of   22
231   48   to the left of   30
232   48   to the left of   29
233   49   to the left of    6
234   49   to the left of   38

[235 rows x 3 columns]