What is covered by the snow?
The branches are covered by the snow.
    src        edge_attr  dst
0     0  to the right of   13
1     0  to the right of    5
2     0   to the left of    2
3     0   to the left of    9
4     0   to the left of    8
..  ...              ...  ...
70   12  to the right of    5
71   13  to the right of    5
72   13   to the left of    0
73   13   to the left of    6
74   13   to the left of   12

[75 rows x 3 columns]