The sign is in front of what?
The sign is in front of the wires.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    7
2     2        on top of    6
3     3  to the right of    9
4     3               on    6
5     4   to the left of    0
6     5           behind    6
7     6      in front of    5
8     7   to the left of    0
9     9               on    6
10    9   to the left of    3