Hex is just a way of showing values.
In the real world people are interested in
decimal coding: 0 1 2 3 4 5 6 7 8 9
, but doing technical aplications,
the Hex coding: 0 1 2 3 4 5 6 7 8 9 A B C D E F is more popular.
If you want to show values in hex in a graph simply right-click y-scale - formatting Format: Hexadecimal.
Patrick