What is the color of that ground?
The ground is gray.
     src        edge_attr  dst
0      0  to the right of    1
1      0  to the right of    5
2      0  to the right of    8
3      0  to the right of   14
4      0  to the right of    4
..   ...              ...  ...
116   17   to the left of   13
117   19   to the left of    7
118   19   to the left of    2
119   19   to the left of   11
120   19   to the left of    9

[121 rows x 3 columns]