Acceleration man. It’s the majority. I’d say “I called it” as a teenager in the 1980s but I was just a smartass kid reiterating Einstein.
32 percent comes from the energy of the quarks
36 percent via their energy (of gluons)
68%. Of course they already knew this ‘in gist’ so me picking that up was just obvious. But it’s nice seeing it all broken down in percentages and stuff.