Root In Heavy-ion Therapy

Dear Root users.
I am using Root to make analysis for data simulated for Heavy-ion therapy applications.
I have a data file contains 3 columns:
1- Atomic numbers (Z).
2- Mass numbers(A).
and
3- Energies.

for each charged particle.

could you please tell me how can I make a histogram to draw " Z vs A vs Counts " as logo for example ?

I will appreciate your helps.

Respectfully,

Morad Hamad

tree.Draw("Z:A","Energy","lego1");
Note that this forum “My ROOT App” is intended for teh announcement of user applications based on ROOT only. Post your questions like this one to the “ROOT Support” thread instead.

Rene