Goodmorning everyone, I'm new to this forum! I'm graduing in physics in Italy, and I have this problem. I want use root to plot the Bragg curve for different kinds of particles, with different initial conditions. the problem is, wich function have I to plot? http://www.med.harvard.edu/JPNM/physics/nmltd/radprin/sect7/7.1/bragg.GIF the Beth Bloch formula? how can I make it "x dependent", where x is the penetration depth? sorry for my english, and my silly question.. I hope you'll help me! thanks a lot!