How to get graph from a TCanvas

[couet]

Yes they all have the same name … too bad.
May be something similar to what is done in this HowTo can help:

How to draw an object with special characters in its name?

In general it is not a good idea to have object’s name containing special character like “”, “/”, “#” etc … or even have object name starting with a number because they might be not accessible from the ROOT command line. For instance “/” is the separator for directory level in a file therefore an object having a “/” in its name cannot be access from the command line. Nevertheless it may happen that the some object can be named that way and stored in a ROOT file. The following macro show how to…