ROOT GUI demo showing a very nice periodic system and element selection panel ----------------------------------------------------------------------------- Use "make" to compile the project. After make you will have a program XSGui. Execute this program and select from the menubar the option "Element/Reaction". To get the periodic system click on the little icon in the top right of the "Select Element/Reaction" panel. For H (isotope 1) and Pb (isotopes 208 and natural) the reactions can be plotted. Select a reaction and click on "Ok" or "Execute". This is a code snapshot of a project in development so not much more can be done, but it shows execellent use of the ROOT GUI. The author is: Vasilis Vlachoudis