What is the color of the cap?
The cap is gray.
    src        edge_attr  dst
0     0  to the right of   23
1     0  to the right of   24
2     0  to the right of    6
3     1  to the right of   16
4     2   to the left of   24
..  ...              ...  ...
77   26  to the right of   10
78   26  to the right of    6
79   26  to the right of    8
80   26  to the right of   23
81   26  to the right of   18

[82 rows x 3 columns]