Which place is it?
It is a field.
   src        edge_attr  dst
0    2   to the left of    7
1    3   to the left of    6
2    4   to the left of    6
3    4   to the left of    8
4    6  to the right of    4
5    6  to the right of    3
6    7  to the right of    2
7    8  to the right of    4