Select a treasure class to see the drop division.
Press on one of the treasure classes in the drop table to show the drop table of that treasure class. In the graph below you can recognize the treasure classes as wide slices, the thin slices represent an item drop. You can also change the difficulty to see the effect on the nodrop chance.
Act 1 (H) Bow A
Whenever a TC is rolled, it can land on either an item (if the TC already contains items) or a sub-TC. The game will continue to roll sub-TCs until it finally reaches an item to drop.
The rune TC are a good example of this. Once your roll a rune TC, it contains the 2 runes of that TC and the rune TC below. If you don't land on one of the runes in the TC, the next rune TC is roll.
TC Act 1 (H) Bow A is used by the following other TCs: