Which side is the tray on?
The tray is on the right of the image.
     src        edge_attr  dst
0      0   to the left of   57
1      0  to the right of    8
2      0   to the left of    6
3      0  to the right of   22
4      0  to the right of   17
..   ...              ...  ...
225   57  to the right of   36
226   57  to the right of   45
227   57  to the right of   49
228   57  to the right of    0
229   57  to the right of    1

[230 rows x 3 columns]