3. The graph shows how different species in the burn phase of inertial confinement fusion equilibrate their temperatures over time, and how fantastically more energetic the fusion produced alpha particles (helium nuclei) are; this is because mass is converted into energy during the fusion process (according to a rather famous equation E = mc2) partly goes to them in the form of kinetic energy. Incredibly, they only receive 20% of the fusion energy, the remaining 80% going to neutrons which are not shown on the graph.