How thick are the black wires?
The wires are thin.
    src        edge_attr  dst
0     0  to the right of    5
1     1   to the left of    4
2     1   to the left of    8
3     2  to the right of    9
4     3   to the left of    9
5     4  to the right of    1
6     4  to the right of    8
7     5   to the left of    0
8     8  to the right of    1
9     8   to the left of    4
10    9  to the right of    3
11    9   to the left of    2
12   11               of   10