How thick is the chain?
The chain is thin.
    src        edge_attr  dst
0     1   to the left of    3
1     1   to the left of   14
2     1   to the left of    9
3     1   to the left of   15
4     1   to the left of   16
..  ...              ...  ...
77   16  to the right of    4
78   16  to the right of    2
79   16  to the right of   12
80   16  to the right of   11
81   17   to the left of   14

[82 rows x 3 columns]