Is the fence in the top part or in the bottom?
The fence is in the bottom of the image.
    src        edge_attr  dst
0     0  to the right of    8
1     1   to the left of   11
2     3               of    0
3     4               of    0
4     5               of    0
5     5   to the left of   11
6     6   to the left of   11
7     6  to the right of   12
8     7   to the left of   11
9     8   to the left of    0
10    8   to the left of    9
11    9  to the right of   10
12    9               of    0
13    9  to the right of    8
14   10   to the left of    9
15   11  to the right of    7
16   11  to the right of    5
17   11  to the right of    1
18   11  to the right of    6
19   12   to the left of    6
20   12               of    0