What is the size of the gray tail?
The tail is large.
    src        edge_attr  dst
0     0   to the left of    5
1     0               of   14
2     0   to the left of   12
3     0   to the left of    9
4     1  to the right of    6
..  ...              ...  ...
81   14   to the left of    4
82   14             near    2
83   14   to the left of   13
84   14   to the left of   12
85   14   to the left of    1

[86 rows x 3 columns]