Are there either mirrors or flags?
Yes, there is a flag.
    src        edge_attr  dst
0     0  to the right of   24
1     0  to the right of   21
2     0  to the right of    6
3     0  to the right of    4
4     0  to the right of   18
..  ...              ...  ...
86   24   to the left of   20
87   25               on   24
88   25  to the right of    7
89   25  to the right of   15
90   25   to the left of    8

[91 rows x 3 columns]